fixed undefined signed integer overflow for expression "1 << 31"
[rocksndiamonds.git] / src / editor.c
index c993b6ea5803e052b90f3a1fb037dff3cf60e0e1..833dce2ec7996d81f106a9d3522178bb274753bc 100644 (file)
@@ -4,7 +4,7 @@
 // (c) 1995-2014 by Artsoft Entertainment
 //                         Holger Schemel
 //                 info@artsoft.org
-//                 http://www.artsoft.org/
+//                 https://www.artsoft.org/
 // ----------------------------------------------------------------------------
 // editor.c
 // ============================================================================
 #define ED_ELEMENTLIST_YPOS            (editor.palette.y)
 #define ED_ELEMENTLIST_XSIZE           (graphic_info[IMG_EDITOR_PALETTE_BUTTON].width)
 #define ED_ELEMENTLIST_YSIZE           (graphic_info[IMG_EDITOR_PALETTE_BUTTON].height)
-#define ED_ELEMENTLIST_BUTTONS_HORIZ   (editor.palette.cols)
-#define ED_ELEMENTLIST_BUTTONS_VERT    (editor.palette.rows)
+#define ED_ELEMENTLIST_COLS            MAX(1, editor.palette.cols)
+#define ED_ELEMENTLIST_ROWS            MAX(1, editor.palette.rows)
+#define ED_ELEMENTLIST_BUTTONS_HORIZ   (ED_ELEMENTLIST_COLS)
+#define ED_ELEMENTLIST_BUTTONS_VERT    (ED_ELEMENTLIST_ROWS)
 #define ED_NUM_ELEMENTLIST_BUTTONS     (ED_ELEMENTLIST_BUTTONS_HORIZ * \
                                         ED_ELEMENTLIST_BUTTONS_VERT)
 
@@ -487,6 +489,12 @@ enum
   GADGET_ID_MOVE_DELAY_RND_DOWN,
   GADGET_ID_MOVE_DELAY_RND_TEXT,
   GADGET_ID_MOVE_DELAY_RND_UP,
+  GADGET_ID_STEP_DELAY_FIX_DOWN,
+  GADGET_ID_STEP_DELAY_FIX_TEXT,
+  GADGET_ID_STEP_DELAY_FIX_UP,
+  GADGET_ID_STEP_DELAY_RND_DOWN,
+  GADGET_ID_STEP_DELAY_RND_TEXT,
+  GADGET_ID_STEP_DELAY_RND_UP,
   GADGET_ID_EXPLOSION_DELAY_DOWN,
   GADGET_ID_EXPLOSION_DELAY_TEXT,
   GADGET_ID_EXPLOSION_DELAY_UP,
@@ -557,6 +565,7 @@ enum
   // selectbox identifiers
 
   GADGET_ID_TIME_OR_STEPS,
+  GADGET_ID_TIME_SCORE_BASE,
   GADGET_ID_GAME_ENGINE_TYPE,
   GADGET_ID_LEVELSET_SAVE_MODE,
   GADGET_ID_WIND_DIRECTION,
@@ -628,6 +637,7 @@ enum
   // checkbuttons/radiobuttons for level/element properties
 
   GADGET_ID_AUTO_COUNT_GEMS,
+  GADGET_ID_RATE_TIME_OVER_SCORE,
   GADGET_ID_USE_LEVELSET_ARTWORK,
   GADGET_ID_COPY_LEVEL_TEMPLATE,
   GADGET_ID_RANDOM_PERCENTAGE,
@@ -640,12 +650,14 @@ enum
   GADGET_ID_USE_TIME_ORB_BUG,
   GADGET_ID_USE_LIFE_BUGS,
   GADGET_ID_RANDOM_BALL_CONTENT,
-  GADGET_ID_INITIAL_BALL_STATE,
+  GADGET_ID_INITIAL_BALL_ACTIVE,
   GADGET_ID_GROW_INTO_DIGGABLE,
   GADGET_ID_SB_FIELDS_NEEDED,
   GADGET_ID_SB_OBJECTS_NEEDED,
   GADGET_ID_AUTO_EXIT_SOKOBAN,
   GADGET_ID_SOLVED_BY_ONE_PLAYER,
+  GADGET_ID_FINISH_DIG_COLLECT,
+  GADGET_ID_KEEP_WALKABLE_CE,
   GADGET_ID_CONTINUOUS_SNAPPING,
   GADGET_ID_BLOCK_SNAP_FIELD,
   GADGET_ID_BLOCK_LAST_FIELD,
@@ -748,6 +760,8 @@ enum
   ED_COUNTER_ID_DROP_DELAY_RND,
   ED_COUNTER_ID_MOVE_DELAY_FIX,
   ED_COUNTER_ID_MOVE_DELAY_RND,
+  ED_COUNTER_ID_STEP_DELAY_FIX,
+  ED_COUNTER_ID_STEP_DELAY_RND,
   ED_COUNTER_ID_EXPLOSION_DELAY,
   ED_COUNTER_ID_IGNITION_DELAY,
   ED_COUNTER_ID_GROUP_CONTENT,
@@ -837,6 +851,7 @@ enum
 enum
 {
   ED_SELECTBOX_ID_TIME_OR_STEPS,
+  ED_SELECTBOX_ID_TIME_SCORE_BASE,
   ED_SELECTBOX_ID_GAME_ENGINE_TYPE,
   ED_SELECTBOX_ID_LEVELSET_SAVE_MODE,
   ED_SELECTBOX_ID_WIND_DIRECTION,
@@ -933,6 +948,7 @@ enum
 enum
 {
   ED_CHECKBUTTON_ID_AUTO_COUNT_GEMS,
+  ED_CHECKBUTTON_ID_RATE_TIME_OVER_SCORE,
   ED_CHECKBUTTON_ID_USE_LEVELSET_ARTWORK,
   ED_CHECKBUTTON_ID_COPY_LEVEL_TEMPLATE,
   ED_CHECKBUTTON_ID_RANDOM_RESTRICTED,
@@ -945,12 +961,14 @@ enum
   ED_CHECKBUTTON_ID_USE_TIME_ORB_BUG,
   ED_CHECKBUTTON_ID_USE_LIFE_BUGS,
   ED_CHECKBUTTON_ID_RANDOM_BALL_CONTENT,
-  ED_CHECKBUTTON_ID_INITIAL_BALL_STATE,
+  ED_CHECKBUTTON_ID_INITIAL_BALL_ACTIVE,
   ED_CHECKBUTTON_ID_GROW_INTO_DIGGABLE,
   ED_CHECKBUTTON_ID_SB_FIELDS_NEEDED,
   ED_CHECKBUTTON_ID_SB_OBJECTS_NEEDED,
   ED_CHECKBUTTON_ID_AUTO_EXIT_SOKOBAN,
   ED_CHECKBUTTON_ID_SOLVED_BY_ONE_PLAYER,
+  ED_CHECKBUTTON_ID_FINISH_DIG_COLLECT,
+  ED_CHECKBUTTON_ID_KEEP_WALKABLE_CE,
   ED_CHECKBUTTON_ID_CONTINUOUS_SNAPPING,
   ED_CHECKBUTTON_ID_BLOCK_SNAP_FIELD,
   ED_CHECKBUTTON_ID_BLOCK_LAST_FIELD,
@@ -1005,7 +1023,7 @@ enum
 };
 
 #define ED_CHECKBUTTON_ID_LEVEL_FIRST  ED_CHECKBUTTON_ID_AUTO_COUNT_GEMS
-#define ED_CHECKBUTTON_ID_LEVEL_LAST   ED_CHECKBUTTON_ID_AUTO_COUNT_GEMS
+#define ED_CHECKBUTTON_ID_LEVEL_LAST   ED_CHECKBUTTON_ID_RATE_TIME_OVER_SCORE
 
 #define ED_CHECKBUTTON_ID_LEVELSET_FIRST ED_CHECKBUTTON_ID_USE_LEVELSET_ARTWORK
 #define ED_CHECKBUTTON_ID_LEVELSET_LAST         ED_CHECKBUTTON_ID_COPY_LEVEL_TEMPLATE
@@ -1406,10 +1424,10 @@ static struct
     GADGET_ID_LEVEL_TIMESCORE_DOWN,    GADGET_ID_LEVEL_TIMESCORE_UP,
     GADGET_ID_LEVEL_TIMESCORE_TEXT,    GADGET_ID_NONE,
     &level.score[SC_TIME_BONUS],
-    "score for each second/step left:",        NULL, NULL
+    "score for time or steps left:",   NULL, NULL
   },
   {
-    ED_LEVEL_SETTINGS_XPOS(0),         ED_LEVEL_SETTINGS_YPOS(12),
+    ED_LEVEL_SETTINGS_XPOS(0),         ED_LEVEL_SETTINGS_YPOS(13),
     0,                                 9999,
     GADGET_ID_LEVEL_RANDOM_SEED_DOWN,  GADGET_ID_LEVEL_RANDOM_SEED_UP,
     GADGET_ID_LEVEL_RANDOM_SEED_TEXT,  GADGET_ID_NONE,
@@ -1602,7 +1620,23 @@ static struct
     NULL,                              "+random", NULL
   },
   {
-    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(12),
+    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(6),
+    0,                                 999,
+    GADGET_ID_STEP_DELAY_FIX_DOWN,     GADGET_ID_STEP_DELAY_FIX_UP,
+    GADGET_ID_STEP_DELAY_FIX_TEXT,     GADGET_ID_NONE,
+    &custom_element.step_delay_fixed,
+    NULL,                              "step delay", NULL
+  },
+  {
+    -1,                                        ED_ELEMENT_SETTINGS_YPOS(6),
+    0,                                 999,
+    GADGET_ID_STEP_DELAY_RND_DOWN,     GADGET_ID_STEP_DELAY_RND_UP,
+    GADGET_ID_STEP_DELAY_RND_TEXT,     GADGET_ID_STEP_DELAY_FIX_UP,
+    &custom_element.step_delay_random,
+    NULL,                              "+random", NULL
+  },
+  {
+    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(13),
     0,                                 999,
     GADGET_ID_EXPLOSION_DELAY_DOWN,    GADGET_ID_EXPLOSION_DELAY_UP,
     GADGET_ID_EXPLOSION_DELAY_TEXT,    GADGET_ID_NONE,
@@ -1610,7 +1644,7 @@ static struct
     NULL,                              "explosion delay", NULL
   },
   {
-    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(13),
+    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(14),
     0,                                 999,
     GADGET_ID_IGNITION_DELAY_DOWN,     GADGET_ID_IGNITION_DELAY_UP,
     GADGET_ID_IGNITION_DELAY_TEXT,     GADGET_ID_NONE,
@@ -1729,6 +1763,14 @@ static struct ValueTextInfo options_time_or_steps[] =
   { -1,                                NULL                            }
 };
 
+static struct ValueTextInfo options_time_score_base[] =
+{
+  { 1,                         "per second/step"               },
+  { 10,                                "per 10 seconds/steps"          },
+
+  { -1,                                NULL                            }
+};
+
 static struct ValueTextInfo options_game_engine_type[] =
 {
   { GAME_ENGINE_TYPE_RND,      "Rocks'n'Diamonds"              },
@@ -1963,6 +2005,13 @@ static struct ValueTextInfo options_change_direct_action[] =
 #endif
   { CE_VALUE_GETS_ZERO,                "CE value gets 0"               },
   { CE_SCORE_GETS_ZERO,                "CE score gets 0"               },
+  { CE_UNDEFINED,              " "                             },
+  { CE_HEADLINE_SPECIAL_EVENTS,        "[mouse events]"                },
+  { CE_CLICKED_BY_MOUSE,       "clicked by mouse"              },
+  { CE_PRESSED_BY_MOUSE,       "pressed by mouse"              },
+  { CE_UNDEFINED,              " "                             },
+  { CE_HEADLINE_SPECIAL_EVENTS,        "[static states]"               },
+  { CE_NEXT_TO_PLAYER,         "next to player"                },
 
   { -1,                                NULL                            }
 };
@@ -1992,6 +2041,14 @@ static struct ValueTextInfo options_change_other_action[] =
   { CE_SCORE_CHANGES_OF_X,     "CE score changes of"           },
   { CE_VALUE_GETS_ZERO_OF_X,   "CE value gets 0 of"            },
   { CE_SCORE_GETS_ZERO_OF_X,   "CE score gets 0 of"            },
+  { CE_UNDEFINED,              " "                             },
+  { CE_HEADLINE_SPECIAL_EVENTS,        "[mouse events]"                },
+  { CE_MOUSE_CLICKED_ON_X,     "mouse clicked on"              },
+  { CE_MOUSE_PRESSED_ON_X,     "mouse pressed on"              },
+  { CE_UNDEFINED,              " "                             },
+  { CE_HEADLINE_SPECIAL_EVENTS,        "[static states]"               },
+  { CE_PLAYER_NEXT_TO_X,       "player next to"                },
+  { CE_NEXT_TO_X,              "next to"                       },
 
   { -1,                                NULL                            }
 };
@@ -2022,38 +2079,38 @@ static struct ValueTextInfo options_change_trigger_player[] =
 
 static struct ValueTextInfo options_change_trigger_page[] =
 {
-  { (1 << 0),                  "1"                             },
-  { (1 << 1),                  "2"                             },
-  { (1 << 2),                  "3"                             },
-  { (1 << 3),                  "4"                             },
-  { (1 << 4),                  "5"                             },
-  { (1 << 5),                  "6"                             },
-  { (1 << 6),                  "7"                             },
-  { (1 << 7),                  "8"                             },
-  { (1 << 8),                  "9"                             },
-  { (1 << 9),                  "10"                            },
-  { (1 << 10),                 "11"                            },
-  { (1 << 11),                 "12"                            },
-  { (1 << 12),                 "13"                            },
-  { (1 << 13),                 "14"                            },
-  { (1 << 14),                 "15"                            },
-  { (1 << 15),                 "16"                            },
-  { (1 << 16),                 "17"                            },
-  { (1 << 17),                 "18"                            },
-  { (1 << 18),                 "19"                            },
-  { (1 << 19),                 "20"                            },
-  { (1 << 20),                 "21"                            },
-  { (1 << 21),                 "22"                            },
-  { (1 << 22),                 "23"                            },
-  { (1 << 23),                 "24"                            },
-  { (1 << 24),                 "25"                            },
-  { (1 << 25),                 "26"                            },
-  { (1 << 26),                 "27"                            },
-  { (1 << 27),                 "28"                            },
-  { (1 << 28),                 "29"                            },
-  { (1 << 29),                 "30"                            },
-  { (1 << 30),                 "31"                            },
-  { (1 << 31),                 "32"                            },
+  { (1u << 0),                 "1"                             },
+  { (1u << 1),                 "2"                             },
+  { (1u << 2),                 "3"                             },
+  { (1u << 3),                 "4"                             },
+  { (1u << 4),                 "5"                             },
+  { (1u << 5),                 "6"                             },
+  { (1u << 6),                 "7"                             },
+  { (1u << 7),                 "8"                             },
+  { (1u << 8),                 "9"                             },
+  { (1u << 9),                 "10"                            },
+  { (1u << 10),                        "11"                            },
+  { (1u << 11),                        "12"                            },
+  { (1u << 12),                        "13"                            },
+  { (1u << 13),                        "14"                            },
+  { (1u << 14),                        "15"                            },
+  { (1u << 15),                        "16"                            },
+  { (1u << 16),                        "17"                            },
+  { (1u << 17),                        "18"                            },
+  { (1u << 18),                        "19"                            },
+  { (1u << 19),                        "20"                            },
+  { (1u << 20),                        "21"                            },
+  { (1u << 21),                        "22"                            },
+  { (1u << 22),                        "23"                            },
+  { (1u << 23),                        "24"                            },
+  { (1u << 24),                        "25"                            },
+  { (1u << 25),                        "26"                            },
+  { (1u << 26),                        "27"                            },
+  { (1u << 27),                        "28"                            },
+  { (1u << 28),                        "29"                            },
+  { (1u << 29),                        "30"                            },
+  { (1u << 30),                        "31"                            },
+  { (1u << 31),                        "32"                            },
   { CH_PAGE_ANY,               "any"                           },
 
   { -1,                                NULL                            }
@@ -2082,10 +2139,11 @@ static struct ValueTextInfo options_action_type[] =
   { CA_SET_LEVEL_SCORE,                "set score"                     },
   { CA_SET_LEVEL_GEMS,         "set gems"                      },
   { CA_SET_LEVEL_WIND,         "set wind dir."                 },
-  { CA_SET_LEVEL_RANDOM_SEED,  "set rand. seed"                },
+  { CA_SET_LEVEL_RANDOM_SEED,  "set random seed"               },
   { CA_UNDEFINED,              " "                             },
   { CA_HEADLINE_PLAYER_ACTIONS,        "[player]"                      },
   { CA_MOVE_PLAYER,            "move player"                   },
+  { CA_MOVE_PLAYER_NEW,                "move player new"               },
   { CA_EXIT_PLAYER,            "exit player"                   },
   { CA_KILL_PLAYER,            "kill player"                   },
   { CA_SET_PLAYER_KEYS,                "set keys"                      },
@@ -2411,6 +2469,7 @@ action_arg_options[] =
   { CA_EXIT_PLAYER,            0,      options_action_arg_player,      },
   { CA_KILL_PLAYER,            0,      options_action_arg_player,      },
   { CA_MOVE_PLAYER,            0,      options_action_arg_direction,   },
+  { CA_MOVE_PLAYER_NEW,                0,      options_action_arg_direction,   },
   { CA_RESTART_LEVEL,          0,      options_action_arg_none,        },
   { CA_SHOW_ENVELOPE,          0,      options_action_arg_envelope,    },
   { CA_SET_LEVEL_TIME,         3,      options_action_arg_number,      },
@@ -2454,7 +2513,15 @@ static struct
     NULL, NULL, "(0 => no limit)",     "time or step limit"
   },
   {
-    ED_LEVEL_SETTINGS_XPOS(0),         ED_LEVEL_SETTINGS_YPOS(11),
+    -1,                                        ED_LEVEL_SETTINGS_YPOS(10),
+    GADGET_ID_TIME_SCORE_BASE,         GADGET_ID_LEVEL_TIMESCORE_UP,
+    -1,
+    options_time_score_base,
+    &level.time_score_base,
+    NULL, NULL, NULL,                  "time score for 1 or 10 seconds/steps"
+  },
+  {
+    ED_LEVEL_SETTINGS_XPOS(0),         ED_LEVEL_SETTINGS_YPOS(12),
     GADGET_ID_GAME_ENGINE_TYPE,                GADGET_ID_NONE,
     -1,
     options_game_engine_type,
@@ -2570,7 +2637,7 @@ static struct
     NULL, "            can", ":",      "leave behind or change element"
   },
   {
-    -1,                                        ED_ELEMENT_SETTINGS_YPOS(7),
+    -1,                                        ED_ELEMENT_SETTINGS_YPOS(8),
     GADGET_ID_CUSTOM_SMASH_TARGETS,    GADGET_ID_CUSTOM_CAN_SMASH,
     -1,
     options_smash_targets,
@@ -2578,7 +2645,7 @@ static struct
     NULL, "can smash", NULL,           "elements that can be smashed"
   },
   {
-    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(8),
+    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(9),
     GADGET_ID_CUSTOM_SLIPPERY_TYPE,    GADGET_ID_NONE,
     -1,
     options_slippery_type,
@@ -2586,7 +2653,7 @@ static struct
     NULL, "slippery", NULL,            "where other elements fall down"
   },
   {
-    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(9),
+    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(10),
     GADGET_ID_CUSTOM_DEADLINESS,       GADGET_ID_NONE,
     -1,
     options_deadliness,
@@ -2594,7 +2661,7 @@ static struct
     NULL, "deadly when", NULL,         "deadliness of element"
   },
   {
-    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(10),
+    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(11),
     GADGET_ID_CUSTOM_EXPLOSION_TYPE,   GADGET_ID_NONE,
     -1,
     options_explosion_type,
@@ -2663,7 +2730,7 @@ static struct
   {
     ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(13),
     GADGET_ID_ACTION_TYPE,             GADGET_ID_NONE,
-    -1,
+    15,
     options_action_type,
     &custom_element_change.action_type,
     NULL, NULL, NULL,                  "action on specified condition"
@@ -2969,6 +3036,13 @@ static struct
     NULL, NULL,
     "automatically count gems needed", "set counter to number of gems"
   },
+  {
+    ED_LEVEL_SETTINGS_XPOS(0),         ED_LEVEL_SETTINGS_YPOS(11),
+    GADGET_ID_RATE_TIME_OVER_SCORE,    GADGET_ID_NONE,
+    &level.rate_time_over_score,
+    NULL, NULL,
+    "rate time/steps used over score", "sort high scores by playing time/steps"
+  },
   {
     ED_LEVEL_SETTINGS_XPOS(0),         ED_LEVEL_SETTINGS_YPOS(7),
     GADGET_ID_USE_LEVELSET_ARTWORK,    GADGET_ID_NONE,
@@ -3058,8 +3132,8 @@ static struct
   },
   {
     ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(1),
-    GADGET_ID_INITIAL_BALL_STATE,      GADGET_ID_NONE,
-    &level.ball_state_initial,
+    GADGET_ID_INITIAL_BALL_ACTIVE,     GADGET_ID_NONE,
+    &level.ball_active_initial,
     NULL, NULL,
     "magic ball initially activated",  "activate magic ball after level start"
   },
@@ -3098,6 +3172,20 @@ static struct
     NULL, NULL,
     "only one player must enter exit", "level solved by first player in exit"
   },
+  {
+    ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(3),
+    GADGET_ID_FINISH_DIG_COLLECT,      GADGET_ID_NONE,
+    &level.finish_dig_collect,
+    NULL, NULL,
+    "CE action on finished dig/collect", "only finished dig/collect triggers CE"
+  },
+  {
+    ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(4),
+    GADGET_ID_KEEP_WALKABLE_CE,                GADGET_ID_NONE,
+    &level.keep_walkable_ce,
+    NULL, NULL,
+    "keep walkable CE changed to player", "keep CE changing to player if walkable"
+  },
   {
     ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(9),
     GADGET_ID_CONTINUOUS_SNAPPING,     GADGET_ID_NONE,
@@ -3329,56 +3417,56 @@ static struct
     NULL,                              "element can move with some pattern"
   },
   {
-    ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(7),
+    ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(8),
     GADGET_ID_CUSTOM_CAN_FALL,         GADGET_ID_NONE,
     &custom_element_properties[EP_CAN_FALL],
     NULL, NULL,
     "can fall",                                "element can fall down"
   },
   {
-    -1,                                        ED_ELEMENT_SETTINGS_YPOS(7),
+    -1,                                        ED_ELEMENT_SETTINGS_YPOS(8),
     GADGET_ID_CUSTOM_CAN_SMASH,                GADGET_ID_CUSTOM_CAN_FALL,
     &custom_element_properties[EP_CAN_SMASH],
     NULL, " ",
     NULL,                              "element can smash other elements"
   },
   {
-    ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(8),
+    ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(9),
     GADGET_ID_CUSTOM_SLIPPERY,         GADGET_ID_NONE,
     &custom_element_properties[EP_SLIPPERY],
     NULL, NULL,
     NULL,                              "other elements can fall down from it"
   },
   {
-    ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(9),
+    ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(10),
     GADGET_ID_CUSTOM_DEADLY,           GADGET_ID_NONE,
     &custom_element_properties[EP_DEADLY],
     NULL, NULL,
     NULL,                              "element can kill the player"
   },
   {
-    ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(10),
+    ED_ELEMENT_SETTINGS_XPOS(0),       ED_ELEMENT_SETTINGS_YPOS(11),
     GADGET_ID_CUSTOM_CAN_EXPLODE,      GADGET_ID_NONE,
     &custom_element_properties[EP_CAN_EXPLODE],
     NULL, NULL,
     NULL,                              "element can explode"
   },
   {
-    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(11),
+    ED_ELEMENT_SETTINGS_XPOS(1),       ED_ELEMENT_SETTINGS_YPOS(12),
     GADGET_ID_CUSTOM_EXPLODE_FIRE,     GADGET_ID_NONE,
     &custom_element_properties[EP_EXPLODES_BY_FIRE],
     NULL, NULL,
     "by fire",                         "element can explode by fire/explosion"
   },
   {
-    -1,                                        ED_ELEMENT_SETTINGS_YPOS(11),
+    -1,                                        ED_ELEMENT_SETTINGS_YPOS(12),
     GADGET_ID_CUSTOM_EXPLODE_SMASH,    GADGET_ID_CUSTOM_EXPLODE_FIRE,
     &custom_element_properties[EP_EXPLODES_SMASHED],
     NULL, " ",
     "smashed",                         "element can explode when smashed"
   },
   {
-    -1,                                        ED_ELEMENT_SETTINGS_YPOS(11),
+    -1,                                        ED_ELEMENT_SETTINGS_YPOS(12),
     GADGET_ID_CUSTOM_EXPLODE_IMPACT,   GADGET_ID_CUSTOM_EXPLODE_SMASH,
     &custom_element_properties[EP_EXPLODES_IMPACT],
     NULL, " ",
@@ -3460,7 +3548,7 @@ static struct
   int gadget_id_align;
   int *value;
   int area_xsize, area_ysize;
-  char *text_left, *text_right, *text_below, *infotext;
+  char *text_left, *text_right, *text_above, *text_below, *infotext;
 } drawingarea_info[ED_NUM_DRAWING_AREAS] =
 {
   // ---------- level playfield content ---------------------------------------
@@ -3471,7 +3559,7 @@ static struct
     GADGET_ID_DRAWING_LEVEL,           GADGET_ID_NONE,
     NULL,
     -1, -1,    // these values are not constant, but can change at runtime
-    NULL, NULL, NULL,                  NULL
+    NULL, NULL, NULL, NULL,            NULL
   },
 
   // ---------- yam yam content -----------------------------------------------
@@ -3481,56 +3569,56 @@ static struct
     ED_AREA_YAMYAM_CONTENT_XOFF(0),    ED_AREA_YAMYAM_CONTENT_YOFF(0),
     GADGET_ID_YAMYAM_CONTENT_0,                GADGET_ID_NONE,
     &level.yamyam_content[0].e[0][0],  3, 3,
-    NULL, NULL, "1",                   NULL
+    NULL, NULL, NULL, "1",             NULL
   },
   {
     ED_AREA_YAMYAM_CONTENT_XPOS,       ED_AREA_YAMYAM_CONTENT_YPOS,
     ED_AREA_YAMYAM_CONTENT_XOFF(1),    ED_AREA_YAMYAM_CONTENT_YOFF(1),
     GADGET_ID_YAMYAM_CONTENT_1,                GADGET_ID_NONE,
     &level.yamyam_content[1].e[0][0],  3, 3,
-    NULL, NULL, "2",                   NULL
+    NULL, NULL, NULL, "2",             NULL
   },
   {
     ED_AREA_YAMYAM_CONTENT_XPOS,       ED_AREA_YAMYAM_CONTENT_YPOS,
     ED_AREA_YAMYAM_CONTENT_XOFF(2),    ED_AREA_YAMYAM_CONTENT_YOFF(2),
     GADGET_ID_YAMYAM_CONTENT_2,                GADGET_ID_NONE,
     &level.yamyam_content[2].e[0][0],  3, 3,
-    NULL, NULL, "3",                   NULL
+    NULL, NULL, NULL, "3",             NULL
   },
   {
     ED_AREA_YAMYAM_CONTENT_XPOS,       ED_AREA_YAMYAM_CONTENT_YPOS,
     ED_AREA_YAMYAM_CONTENT_XOFF(3),    ED_AREA_YAMYAM_CONTENT_YOFF(3),
     GADGET_ID_YAMYAM_CONTENT_3,                GADGET_ID_NONE,
     &level.yamyam_content[3].e[0][0],  3, 3,
-    NULL, NULL, "4",                   NULL
+    NULL, NULL, NULL, "4",             NULL
   },
   {
     ED_AREA_YAMYAM_CONTENT_XPOS,       ED_AREA_YAMYAM_CONTENT_YPOS,
     ED_AREA_YAMYAM_CONTENT_XOFF(4),    ED_AREA_YAMYAM_CONTENT_YOFF(4),
     GADGET_ID_YAMYAM_CONTENT_4,                GADGET_ID_NONE,
     &level.yamyam_content[4].e[0][0],  3, 3,
-    NULL, NULL, "5",                   NULL
+    NULL, NULL, NULL, "5",             NULL
   },
   {
     ED_AREA_YAMYAM_CONTENT_XPOS,       ED_AREA_YAMYAM_CONTENT_YPOS,
     ED_AREA_YAMYAM_CONTENT_XOFF(5),    ED_AREA_YAMYAM_CONTENT_YOFF(5),
     GADGET_ID_YAMYAM_CONTENT_5,                GADGET_ID_NONE,
     &level.yamyam_content[5].e[0][0],  3, 3,
-    NULL, NULL, "6",                   NULL
+    NULL, NULL, NULL, "6",             NULL
   },
   {
     ED_AREA_YAMYAM_CONTENT_XPOS,       ED_AREA_YAMYAM_CONTENT_YPOS,
     ED_AREA_YAMYAM_CONTENT_XOFF(6),    ED_AREA_YAMYAM_CONTENT_YOFF(6),
     GADGET_ID_YAMYAM_CONTENT_6,                GADGET_ID_NONE,
     &level.yamyam_content[6].e[0][0],  3, 3,
-    NULL, NULL, "7",                   NULL
+    NULL, NULL, NULL, "7",             NULL
   },
   {
     ED_AREA_YAMYAM_CONTENT_XPOS,       ED_AREA_YAMYAM_CONTENT_YPOS,
     ED_AREA_YAMYAM_CONTENT_XOFF(7),    ED_AREA_YAMYAM_CONTENT_YOFF(7),
     GADGET_ID_YAMYAM_CONTENT_7,                GADGET_ID_NONE,
     &level.yamyam_content[7].e[0][0],  3, 3,
-    NULL, NULL, "8",                   NULL
+    NULL, NULL, NULL, "8",             NULL
   },
 
   // ---------- magic ball content --------------------------------------------
@@ -3540,66 +3628,66 @@ static struct
     ED_AREA_MAGIC_BALL_CONTENT_XOFF(0),        ED_AREA_MAGIC_BALL_CONTENT_YOFF(0),
     GADGET_ID_MAGIC_BALL_CONTENT_0,    GADGET_ID_NONE,
     &level.ball_content[0].e[0][0],    3, 3,
-    NULL, NULL, "1",                   NULL
+    NULL, NULL, NULL, "1",             NULL
   },
   {
     ED_AREA_MAGIC_BALL_CONTENT_XPOS,   ED_AREA_MAGIC_BALL_CONTENT_YPOS,
     ED_AREA_MAGIC_BALL_CONTENT_XOFF(1),        ED_AREA_MAGIC_BALL_CONTENT_YOFF(1),
     GADGET_ID_MAGIC_BALL_CONTENT_1,    GADGET_ID_NONE,
     &level.ball_content[1].e[0][0],    3, 3,
-    NULL, NULL, "2",                   NULL
+    NULL, NULL, NULL, "2",             NULL
   },
   {
     ED_AREA_MAGIC_BALL_CONTENT_XPOS,   ED_AREA_MAGIC_BALL_CONTENT_YPOS,
     ED_AREA_MAGIC_BALL_CONTENT_XOFF(2),        ED_AREA_MAGIC_BALL_CONTENT_YOFF(2),
     GADGET_ID_MAGIC_BALL_CONTENT_2,    GADGET_ID_NONE,
     &level.ball_content[2].e[0][0],    3, 3,
-    NULL, NULL, "3",                   NULL
+    NULL, NULL, NULL, "3",             NULL
   },
   {
     ED_AREA_MAGIC_BALL_CONTENT_XPOS,   ED_AREA_MAGIC_BALL_CONTENT_YPOS,
     ED_AREA_MAGIC_BALL_CONTENT_XOFF(3),        ED_AREA_MAGIC_BALL_CONTENT_YOFF(3),
     GADGET_ID_MAGIC_BALL_CONTENT_3,    GADGET_ID_NONE,
     &level.ball_content[3].e[0][0],    3, 3,
-    NULL, NULL, "4",                   NULL
+    NULL, NULL, NULL, "4",             NULL
   },
   {
     ED_AREA_MAGIC_BALL_CONTENT_XPOS,   ED_AREA_MAGIC_BALL_CONTENT_YPOS,
     ED_AREA_MAGIC_BALL_CONTENT_XOFF(4),        ED_AREA_MAGIC_BALL_CONTENT_YOFF(4),
     GADGET_ID_MAGIC_BALL_CONTENT_4,    GADGET_ID_NONE,
     &level.ball_content[4].e[0][0],    3, 3,
-    NULL, NULL, "5",                   NULL
+    NULL, NULL, NULL, "5",             NULL
   },
   {
     ED_AREA_MAGIC_BALL_CONTENT_XPOS,   ED_AREA_MAGIC_BALL_CONTENT_YPOS,
     ED_AREA_MAGIC_BALL_CONTENT_XOFF(5),        ED_AREA_MAGIC_BALL_CONTENT_YOFF(5),
     GADGET_ID_MAGIC_BALL_CONTENT_5,    GADGET_ID_NONE,
     &level.ball_content[5].e[0][0],    3, 3,
-    NULL, NULL, "6",                   NULL
+    NULL, NULL, NULL, "6",             NULL
   },
   {
     ED_AREA_MAGIC_BALL_CONTENT_XPOS,   ED_AREA_MAGIC_BALL_CONTENT_YPOS,
     ED_AREA_MAGIC_BALL_CONTENT_XOFF(6),        ED_AREA_MAGIC_BALL_CONTENT_YOFF(6),
     GADGET_ID_MAGIC_BALL_CONTENT_6,    GADGET_ID_NONE,
     &level.ball_content[6].e[0][0],    3, 3,
-    NULL, NULL, "7",                   NULL
+    NULL, NULL, NULL, "7",             NULL
   },
   {
     ED_AREA_MAGIC_BALL_CONTENT_XPOS,   ED_AREA_MAGIC_BALL_CONTENT_YPOS,
     ED_AREA_MAGIC_BALL_CONTENT_XOFF(7),        ED_AREA_MAGIC_BALL_CONTENT_YOFF(7),
     GADGET_ID_MAGIC_BALL_CONTENT_7,    GADGET_ID_NONE,
     &level.ball_content[7].e[0][0],    3, 3,
-    NULL, NULL, "8",                   NULL
+    NULL, NULL, NULL, "8",             NULL
   },
 
   // ---------- android content -----------------------------------------------
 
   {
-    ED_AREA_1X1_SETTINGS_XPOS(0),      ED_AREA_1X1_SETTINGS_YPOS(5),
+    ED_AREA_1X1_SETTINGS_XPOS(0),      ED_AREA_1X1_SETTINGS_YPOS(6),
     ED_AREA_1X1_SETTINGS_XOFF,         ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_ANDROID_CONTENT,         GADGET_ID_NONE,
     &level.android_clone_element[0],   MAX_ANDROID_ELEMENTS, 1,
-    "elements:", NULL, NULL,           "elements android can clone"
+    NULL, NULL, "elements:", NULL,     "elements android can clone"
   },
 
   // ---------- amoeba content ------------------------------------------------
@@ -3609,7 +3697,7 @@ static struct
     ED_AREA_1X1_SETTINGS_XOFF,         ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_AMOEBA_CONTENT,          GADGET_ID_NONE,
     &level.amoeba_content,             1, 1,
-    "content:", NULL, NULL,            "amoeba content"
+    "content:", NULL, NULL, NULL,      "amoeba content"
   },
 
   // ---------- level start element -------------------------------------------
@@ -3619,7 +3707,7 @@ static struct
     0,                                 ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_START_ELEMENT,           GADGET_ID_USE_START_ELEMENT,
     &level.start_element[0],           1, 1,
-    NULL, NULL, NULL,                  "level start element"
+    NULL, NULL, NULL, NULL,            "level start element"
   },
 
   // ---------- player artwork element ----------------------------------------
@@ -3629,7 +3717,7 @@ static struct
     0,                                 ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_ARTWORK_ELEMENT,         GADGET_ID_USE_ARTWORK_ELEMENT,
     &level.artwork_element[0],         1, 1,
-    NULL, NULL, NULL,                  "element for player artwork"
+    NULL, NULL, NULL, NULL,            "element for player artwork"
   },
 
   // ---------- player explosion element --------------------------------------
@@ -3639,7 +3727,7 @@ static struct
     0,                                 ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_EXPLOSION_ELEMENT,       GADGET_ID_USE_EXPLOSION_ELEMENT,
     &level.explosion_element[0],       1, 1,
-    NULL, NULL, NULL,                  "element for player explosion"
+    NULL, NULL, NULL, NULL,            "element for player explosion"
   },
 
   // ---------- player initial inventory --------------------------------------
@@ -3649,7 +3737,7 @@ static struct
     0,                                 ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_INVENTORY_CONTENT,       GADGET_ID_USE_INITIAL_INVENTORY,
     &level.initial_inventory_content[0][0], MAX_INITIAL_INVENTORY_SIZE, 1,
-    NULL, NULL, NULL,                  "content for initial inventory"
+    NULL, NULL, NULL, NULL,            "content for initial inventory"
   },
 
   // ---------- element settings: configure 1 (custom elements) ---------------
@@ -3661,7 +3749,7 @@ static struct
     0,                                 ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_CUSTOM_GRAPHIC,          GADGET_ID_CUSTOM_USE_GRAPHIC,
     &custom_element.gfx_element_initial,1, 1,
-    NULL, NULL, NULL,                  "custom graphic element"
+    NULL, NULL, NULL, NULL,            "custom graphic element"
   },
 
   // ---------- element settings: configure 2 (custom elements) ---------------
@@ -3669,11 +3757,11 @@ static struct
   // ---------- custom content (when exploding) -------------------------------
 
   {
-    -1,                                        ED_AREA_3X3_SETTINGS_YPOS(10),
+    -1,                                        ED_AREA_3X3_SETTINGS_YPOS(11),
     0,                                 ED_AREA_3X3_SETTINGS_YOFF,
     GADGET_ID_CUSTOM_CONTENT,          GADGET_ID_NONE, // align three rows
     &custom_element.content.e[0][0],   3, 3,
-    "content:", NULL, NULL,            NULL
+    "content:", NULL, NULL, NULL,      NULL
   },
 
   // ---------- custom enter and leave element (when moving) ------------------
@@ -3683,14 +3771,14 @@ static struct
     ED_AREA_1X1_SETTINGS_XOFF,         ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_CUSTOM_MOVE_ENTER,       GADGET_ID_NONE,
     &custom_element.move_enter_element,        1, 1,
-    "can dig:", " ", NULL,             "element that can be digged/collected"
+    "can dig:", " ", NULL, NULL,       "element that can be digged/collected"
   },
   {
     -1,                                        ED_AREA_1X1_SETTINGS_YPOS(3),
     0,                                 ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_CUSTOM_MOVE_LEAVE,       GADGET_ID_CUSTOM_MOVE_LEAVE_TYPE,
     &custom_element.move_leave_element,        1, 1,
-    NULL, NULL, NULL,                  "element that will be left behind"
+    NULL, NULL, NULL, NULL,            "element that will be left behind"
   },
 
   // ---------- element settings: advanced (custom elements) ------------------
@@ -3702,7 +3790,7 @@ static struct
     0,                                 ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_CUSTOM_CHANGE_TARGET,    GADGET_ID_CUSTOM_CAN_CHANGE,
     &custom_element_change.target_element, 1, 1,
-    NULL, "after/when:", NULL,         "new target element after change"
+    NULL, "after/when:", NULL, NULL,   "new target element after change"
   },
 
   // ---------- custom change content (extended change target) ----------------
@@ -3712,7 +3800,7 @@ static struct
     0,                                 ED_AREA_3X3_SETTINGS_YOFF,
     GADGET_ID_CUSTOM_CHANGE_CONTENT,   GADGET_ID_NONE, // align three rows
     &custom_element_change.target_content.e[0][0], 3, 3,
-    NULL, NULL, NULL,                  "new extended elements after change"
+    NULL, NULL, NULL, NULL,            "new extended elements after change"
   },
 
   // ---------- custom change trigger (element causing change) ----------------
@@ -3722,7 +3810,7 @@ static struct
     0,                                 ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_CUSTOM_CHANGE_TRIGGER,   GADGET_ID_CHANGE_OTHER_ACTION,
     &custom_element_change.initial_trigger_element, 1, 1,
-    NULL, NULL, NULL,                  "other element triggering change"
+    NULL, NULL, NULL, NULL,            "other element triggering change"
   },
 
   // ---------- custom change action (element used for action) ----------------
@@ -3732,7 +3820,7 @@ static struct
     0,                                 ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_CUSTOM_CHANGE_ACTION,    GADGET_ID_ACTION_ARG,
     &custom_element_change.action_element, 1, 1,
-    NULL, NULL, NULL,                  "element used as action parameter"
+    NULL, NULL, NULL, NULL,            "element used as action parameter"
   },
 
   // ---------- group element content -----------------------------------------
@@ -3742,7 +3830,7 @@ static struct
     ED_AREA_1X1_SETTINGS_XOFF,         ED_AREA_1X1_SETTINGS_YOFF,
     GADGET_ID_GROUP_CONTENT,           GADGET_ID_NONE,
     &group_element_info.element[0],    MAX_ELEMENTS_IN_GROUP, 1,
-    "content:", NULL, NULL,            NULL
+    "content:", NULL, NULL, NULL,      NULL
   },
 
   // ---------- random background (for random painting) -----------------------
@@ -3752,7 +3840,7 @@ static struct
     0,                                 ED_AREA_1X1_LSETTINGS_YOFF,
     GADGET_ID_RANDOM_BACKGROUND,       GADGET_ID_RANDOM_RESTRICTED,
     &random_placement_background_element, 1, 1,
-    NULL, NULL, NULL,                  "random placement background"
+    NULL, NULL, NULL, NULL,            "random placement background"
   },
 };
 
@@ -3844,7 +3932,7 @@ static int last_drawing_function = GADGET_ID_SINGLE_ITEMS;
 static boolean draw_with_brush = FALSE;
 static int properties_element = 0;
 
-static short FieldBackup[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
+static short TileBackup[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
 static short UndoBuffer[NUM_UNDO_STEPS][MAX_LEV_FIELDX][MAX_LEV_FIELDY];
 static short IntelliDrawBuffer[MAX_LEV_FIELDX][MAX_LEV_FIELDY];
 static int undo_buffer_position = 0;
@@ -4044,13 +4132,13 @@ static int editor_el_emerald_mine_club[] =
 
   EL_EMC_MAGIC_BALL,
   EL_EMC_MAGIC_BALL_SWITCH,
-  EL_SPRING,
-  EL_EMC_SPRING_BUMPER,
-
   EL_EMC_LENSES,
   EL_EMC_MAGNIFIER,
-  EL_EMPTY,
-  EL_EMPTY,
+
+  EL_SPRING_LEFT,
+  EL_SPRING,
+  EL_SPRING_RIGHT,
+  EL_EMC_SPRING_BUMPER,
 
   EL_BALLOON,
   EL_YAMYAM_UP,
@@ -5184,6 +5272,41 @@ static int *editor_el_group_ptr = editor_el_group;
 static int num_editor_hl_group = ARRAY_SIZE(editor_hl_group);
 static int num_editor_el_group = ARRAY_SIZE(editor_el_group);
 
+static int editor_hl_empty_space[] =
+{
+  EL_INTERNAL_CASCADE_ES_ACTIVE,
+  EL_CHAR('E'),
+  EL_CHAR('S'),
+  EL_EMPTY,
+};
+
+static int editor_el_empty_space[] =
+{
+  EL_EMPTY_SPACE_1,
+  EL_EMPTY_SPACE_2,
+  EL_EMPTY_SPACE_3,
+  EL_EMPTY_SPACE_4,
+
+  EL_EMPTY_SPACE_5,
+  EL_EMPTY_SPACE_6,
+  EL_EMPTY_SPACE_7,
+  EL_EMPTY_SPACE_8,
+
+  EL_EMPTY_SPACE_9,
+  EL_EMPTY_SPACE_10,
+  EL_EMPTY_SPACE_11,
+  EL_EMPTY_SPACE_12,
+
+  EL_EMPTY_SPACE_13,
+  EL_EMPTY_SPACE_14,
+  EL_EMPTY_SPACE_15,
+  EL_EMPTY_SPACE_16
+};
+static int *editor_hl_empty_space_ptr = editor_hl_empty_space;
+static int *editor_el_empty_space_ptr = editor_el_empty_space;
+static int num_editor_hl_empty_space = ARRAY_SIZE(editor_hl_empty_space);
+static int num_editor_el_empty_space = ARRAY_SIZE(editor_el_empty_space);
+
 static int editor_hl_reference[] =
 {
   EL_INTERNAL_CASCADE_REF_ACTIVE,
@@ -5396,6 +5519,12 @@ editor_elements_info[] =
     &editor_hl_group_ptr,              &num_editor_hl_group,
     &editor_el_group_ptr,              &num_editor_el_group
   },
+  {
+    &setup_editor_el_custom,
+    &setup.editor_cascade.el_es,
+    &editor_hl_empty_space_ptr,                &num_editor_hl_empty_space,
+    &editor_el_empty_space_ptr,                &num_editor_el_empty_space
+  },
   {
     &setup_editor_el_custom,
     &setup.editor_cascade.el_ref,
@@ -5428,6 +5557,14 @@ editor_elements_info[] =
   }
 };
 
+static struct XY xy_directions[] =
+{
+  { -1,  0 },
+  { +1,  0 },
+  {  0, -1 },
+  {  0, +1 }
+};
+
 
 // ----------------------------------------------------------------------------
 // functions
@@ -5481,7 +5618,7 @@ static char *getElementInfoText(int element)
 
 static char *getElementDescriptionFilenameExt(char *basename)
 {
-  char *elements_subdir = "elements";
+  char *elements_subdir = ELEMENTS_DIRECTORY;
   static char *elements_subdir2 = NULL;
   static char *filename = NULL;
 
@@ -5522,6 +5659,11 @@ static char *getElementDescriptionFilename(int element)
   if (filename != NULL)
     return filename;
 
+  // 3rd try: look for generic fallback text file for any element
+  filename = getElementDescriptionFilenameExt(FALLBACK_TEXT_FILENAME);
+  if (filename != NULL)
+    return filename;
+
   return NULL;
 }
 
@@ -5544,8 +5686,8 @@ static void InitDynamicEditorElementList(int **elements, int *num_elements)
   // find all elements used in current level
   for (y = 0; y < lev_fieldy; y++)
     for (x = 0; x < lev_fieldx; x++)
-      if (Feld[x][y] < NUM_FILE_ELEMENTS)      // should always be true
-       element_found[Feld[x][y]] = TRUE;
+      if (Tile[x][y] < NUM_FILE_ELEMENTS)      // should always be true
+       element_found[Tile[x][y]] = TRUE;
 
   *num_elements = 0;
 
@@ -5737,10 +5879,10 @@ static void ReinitializeElementList(void)
       int element = (*editor_elements_info[i].element_list)[j];
 
       if (element >= NUM_FILE_ELEMENTS)
-       Error(ERR_WARN, "editor element %d is runtime element", element);
+       Warn("editor element %d is runtime element", element);
 
       if (strEqual(getElementInfoText(element), INFOTEXT_UNKNOWN_ELEMENT))
-       Error(ERR_WARN, "no element description text for element %d", element);
+       Warn("no element description text for element %d", element);
     }
   }
 
@@ -5758,7 +5900,7 @@ static void ReinitializeElementList(void)
       {
        // required for correct padding of palette headline buttons
        if (*editor_elements_info[i].headline_list_size > 0)
-         num_editor_elements += editor.palette.cols;
+         num_editor_elements += ED_ELEMENTLIST_COLS;
 
        for (j = 0; j < *editor_elements_info[i].headline_list_size; j++)
        {
@@ -5775,8 +5917,8 @@ static void ReinitializeElementList(void)
       // required for correct padding of palette element buttons
       int element_list_size = *editor_elements_info[i].element_list_size;
       int element_rows =
-       (element_list_size + editor.palette.cols - 1) / editor.palette.cols;
-      int element_buttons = editor.palette.cols * element_rows;
+       (element_list_size + ED_ELEMENTLIST_COLS - 1) / ED_ELEMENTLIST_COLS;
+      int element_buttons = ED_ELEMENTLIST_COLS * element_rows;
 
       num_editor_elements += element_buttons;
     }
@@ -5808,7 +5950,7 @@ static void ReinitializeElementList(void)
       {
        // required for correct padding of palette headline buttons
        int headline_size = (*editor_elements_info[i].headline_list_size > 0 ?
-                            editor.palette.cols : 0);
+                            ED_ELEMENTLIST_COLS : 0);
 
        for (j = 0; j < headline_size; j++)
        {
@@ -5830,8 +5972,8 @@ static void ReinitializeElementList(void)
       // required for correct padding of palette element buttons
       int element_list_size = *editor_elements_info[i].element_list_size;
       int element_rows =
-       (element_list_size + editor.palette.cols - 1) / editor.palette.cols;
-      int element_buttons = editor.palette.cols * element_rows;
+       (element_list_size + ED_ELEMENTLIST_COLS - 1) / ED_ELEMENTLIST_COLS;
+      int element_buttons = ED_ELEMENTLIST_COLS * element_rows;
 
       // copy all elements from element list
       for (j = 0; j < element_list_size; j++)
@@ -6206,7 +6348,7 @@ static void CreateControlButtons(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
   }
@@ -6272,7 +6414,7 @@ static void CreateControlButtons(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
   }
@@ -6325,7 +6467,7 @@ static void CreateControlButtons(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
   }
@@ -6419,7 +6561,7 @@ static void CreateCounterButtons(void)
                        GDI_END);
 
       if (gi == NULL)
-       Error(ERR_EXIT, "cannot create gadget");
+       Fail("cannot create gadget");
 
       level_editor_gadget[id] = gi;
       right_gadget_border[id] =
@@ -6481,7 +6623,7 @@ static void CreateCounterButtons(void)
                          GDI_END);
 
        if (gi == NULL)
-         Error(ERR_EXIT, "cannot create gadget");
+         Fail("cannot create gadget");
 
        level_editor_gadget[id] = gi;
        right_gadget_border[id] =
@@ -6539,7 +6681,7 @@ static void CreateDrawingAreas(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
     right_gadget_border[id] =
@@ -6612,7 +6754,7 @@ static void CreateTextInputGadgets(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
   }
@@ -6661,7 +6803,7 @@ static void CreateTextAreaGadgets(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
   }
@@ -6740,7 +6882,7 @@ static void CreateSelectboxGadgets(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
     right_gadget_border[id] =
@@ -6824,7 +6966,7 @@ static void CreateTextbuttonGadgets(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
     right_gadget_border[id] =
@@ -6880,7 +7022,7 @@ static void CreateGraphicbuttonGadgets(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
     right_gadget_border[id] =
@@ -6995,7 +7137,7 @@ static void CreateScrollbarGadgets(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
   }
@@ -7055,7 +7197,7 @@ static void CreateCheckbuttonGadgets(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
     right_gadget_border[id] =
@@ -7120,7 +7262,7 @@ static void CreateRadiobuttonGadgets(void)
                      GDI_END);
 
     if (gi == NULL)
-      Error(ERR_EXIT, "cannot create gadget");
+      Fail("cannot create gadget");
 
     level_editor_gadget[id] = gi;
     right_gadget_border[id] =
@@ -7139,14 +7281,17 @@ void CreateLevelEditorGadgets(void)
 
   num_editor_gadgets = NUM_EDITOR_GADGETS;
 
-  // printf("::: allocating %d gadgets ...\n", num_editor_gadgets);
+  // Debug("editor", "allocating %d gadgets ...\n", num_editor_gadgets);
 
   level_editor_gadget =
     checked_calloc(num_editor_gadgets * sizeof(struct GadgetInfo *));
   right_gadget_border =
     checked_calloc(num_editor_gadgets * sizeof(int));
 
-  editor_el_empty = checked_calloc(ED_NUM_ELEMENTLIST_BUTTONS * sizeof(int));
+  // set number of empty (padding) element buttons to maximum number of buttons
+  num_editor_el_empty = ED_NUM_ELEMENTLIST_BUTTONS;
+
+  editor_el_empty = checked_calloc(num_editor_el_empty * sizeof(int));
   editor_el_empty_ptr = editor_el_empty;
 
   use_permanent_palette = !editor.palette.show_as_separate_screen;
@@ -7174,7 +7319,7 @@ void FreeLevelEditorGadgets(void)
 {
   int i;
 
-  // printf("::: freeing %d gadgets ...\n", num_editor_gadgets);
+  // Debug("editor", "freeing %d gadgets ...\n", num_editor_gadgets);
 
   for (i = 0; i < num_editor_gadgets; i++)
   {
@@ -7288,8 +7433,10 @@ static void MapDrawingArea(int id)
   int xoffset_below = getTextWidth(drawingarea_info[id].text_below, font_nr);
   int x_left  = gi->x - xoffset_left;
   int x_right = gi->x + gi->width + ED_DRAWINGAREA_TEXT_DISTANCE;
+  int x_above = gi->x - ED_DRAWINGAREA_BORDER_SIZE;
   int x_below = gi->x + (gi->width - xoffset_below) / 2;
   int y_side  = gi->y + (gi->height - font_height) / 2;
+  int y_above = gi->y - font_height - ED_DRAWINGAREA_TEXT_DISTANCE;
   int y_below = gi->y + gi->height + ED_DRAWINGAREA_TEXT_DISTANCE;
 
   if (drawingarea_info[id].text_left)
@@ -7298,6 +7445,9 @@ static void MapDrawingArea(int id)
   if (drawingarea_info[id].text_right)
     DrawText(x_right, y_side, drawingarea_info[id].text_right, font_nr);
 
+  if (drawingarea_info[id].text_above)
+    DrawText(x_above, y_above, drawingarea_info[id].text_above, font_nr);
+
   if (drawingarea_info[id].text_below)
     DrawText(x_below, y_below, drawingarea_info[id].text_below, font_nr);
 
@@ -7674,7 +7824,7 @@ static boolean LevelChanged(void)
 
   for (y = 0; y < lev_fieldy; y++) 
     for (x = 0; x < lev_fieldx; x++)
-      if (Feld[x][y] != level.field[x][y])
+      if (Tile[x][y] != level.field[x][y])
        field_changed = TRUE;
 
   return (level.changed || field_changed);
@@ -7702,7 +7852,7 @@ static boolean PrepareSavingIntoPersonalLevelSet(void)
     return TRUE;
   }
 
-  if (!Request("This level is read only! "
+  if (!Request("This level is read-only! "
               "Save into personal level set?", REQ_ASK))
     return FALSE;
 
@@ -7710,6 +7860,17 @@ static boolean PrepareSavingIntoPersonalLevelSet(void)
   leveldir_current =
     getTreeInfoFromIdentifier(leveldir_first, getLoginName());
 
+  // this may happen if "setup.internal.create_user_levelset" is FALSE
+  // or if file "levelinfo.conf" is missing in personal user level set
+  if (leveldir_current == NULL)
+  {
+    Request("Cannot find personal level set?!", REQ_CONFIRM);
+
+    leveldir_current = leveldir_former;
+
+    return FALSE;
+  }
+
   // find unused level number
   for (new_level_nr = leveldir_current->first_level; ; new_level_nr++)
   {
@@ -7928,8 +8089,8 @@ static void replace_custom_element_in_playfield(int element_from,
 
   for (x = 0; x < lev_fieldx; x++)
     for (y = 0; y < lev_fieldy; y++)
-      if (Feld[x][y] == element_from)
-       Feld[x][y] = element_to;
+      if (Tile[x][y] == element_from)
+       Tile[x][y] = element_to;
 }
 
 static boolean CopyCustomElement(int element_old, int element_new,
@@ -8105,7 +8266,8 @@ static void CopyCustomElementPropertiesToEditor(int element)
 
   // set "change by direct action" selectbox help value
   custom_element_change.direct_action =
-    (HAS_CHANGE_EVENT(element, CE_TOUCHED_BY_PLAYER) ? CE_TOUCHED_BY_PLAYER :
+    (HAS_CHANGE_EVENT(element, CE_NEXT_TO_PLAYER) ? CE_NEXT_TO_PLAYER :
+     HAS_CHANGE_EVENT(element, CE_TOUCHED_BY_PLAYER) ? CE_TOUCHED_BY_PLAYER :
      HAS_CHANGE_EVENT(element, CE_PRESSED_BY_PLAYER) ? CE_PRESSED_BY_PLAYER :
      HAS_CHANGE_EVENT(element, CE_SWITCHED_BY_PLAYER) ? CE_SWITCHED_BY_PLAYER :
      HAS_CHANGE_EVENT(element, CE_SNAPPED_BY_PLAYER) ? CE_SNAPPED_BY_PLAYER :
@@ -8123,11 +8285,14 @@ static void CopyCustomElementPropertiesToEditor(int element)
      HAS_CHANGE_EVENT(element, CE_SCORE_CHANGES) ? CE_SCORE_CHANGES :
      HAS_CHANGE_EVENT(element, CE_VALUE_GETS_ZERO) ? CE_VALUE_GETS_ZERO :
      HAS_CHANGE_EVENT(element, CE_SCORE_GETS_ZERO) ? CE_SCORE_GETS_ZERO :
+     HAS_CHANGE_EVENT(element, CE_CLICKED_BY_MOUSE) ? CE_CLICKED_BY_MOUSE :
+     HAS_CHANGE_EVENT(element, CE_PRESSED_BY_MOUSE) ? CE_PRESSED_BY_MOUSE :
      custom_element_change.direct_action);
 
   // set "change by other element action" selectbox help value
   custom_element_change.other_action =
-    (HAS_CHANGE_EVENT(element, CE_PLAYER_TOUCHES_X) ? CE_PLAYER_TOUCHES_X :
+    (HAS_CHANGE_EVENT(element, CE_PLAYER_NEXT_TO_X) ? CE_PLAYER_NEXT_TO_X :
+     HAS_CHANGE_EVENT(element, CE_PLAYER_TOUCHES_X) ? CE_PLAYER_TOUCHES_X :
      HAS_CHANGE_EVENT(element, CE_PLAYER_PRESSES_X) ? CE_PLAYER_PRESSES_X :
      HAS_CHANGE_EVENT(element, CE_PLAYER_SWITCHES_X) ? CE_PLAYER_SWITCHES_X :
      HAS_CHANGE_EVENT(element, CE_PLAYER_SNAPS_X) ? CE_PLAYER_SNAPS_X :
@@ -8137,6 +8302,7 @@ static void CopyCustomElementPropertiesToEditor(int element)
      HAS_CHANGE_EVENT(element, CE_PLAYER_DIGS_X) ? CE_PLAYER_DIGS_X :
      HAS_CHANGE_EVENT(element, CE_PLAYER_COLLECTS_X) ? CE_PLAYER_COLLECTS_X :
      HAS_CHANGE_EVENT(element, CE_PLAYER_DROPS_X) ? CE_PLAYER_DROPS_X :
+     HAS_CHANGE_EVENT(element, CE_NEXT_TO_X) ? CE_NEXT_TO_X :
      HAS_CHANGE_EVENT(element, CE_TOUCHING_X) ? CE_TOUCHING_X :
      HAS_CHANGE_EVENT(element, CE_HITTING_X) ? CE_HITTING_X :
      HAS_CHANGE_EVENT(element, CE_DIGGING_X) ? CE_DIGGING_X :
@@ -8150,6 +8316,8 @@ static void CopyCustomElementPropertiesToEditor(int element)
      HAS_CHANGE_EVENT(element, CE_SCORE_CHANGES_OF_X) ? CE_SCORE_CHANGES_OF_X :
      HAS_CHANGE_EVENT(element, CE_VALUE_GETS_ZERO_OF_X) ? CE_VALUE_GETS_ZERO_OF_X :
      HAS_CHANGE_EVENT(element, CE_SCORE_GETS_ZERO_OF_X) ? CE_SCORE_GETS_ZERO_OF_X :
+     HAS_CHANGE_EVENT(element, CE_MOUSE_CLICKED_ON_X) ? CE_MOUSE_CLICKED_ON_X :
+     HAS_CHANGE_EVENT(element, CE_MOUSE_PRESSED_ON_X) ? CE_MOUSE_PRESSED_ON_X :
      custom_element_change.other_action);
 }
 
@@ -8159,9 +8327,14 @@ static void CopyGroupElementPropertiesToEditor(int element)
   custom_element = element_info[element];      // needed for description
 }
 
+static void CopyEmptyElementPropertiesToEditor(int element)
+{
+  custom_element = element_info[element];
+}
+
 static void CopyClassicElementPropertiesToEditor(int element)
 {
-  if (ELEM_IS_PLAYER(element) || COULD_MOVE_INTO_ACID(element))
+  if (IS_PLAYER_ELEMENT(element) || COULD_MOVE_INTO_ACID(element))
     custom_element_properties[EP_CAN_MOVE_INTO_ACID] =
       getMoveIntoAcidProperty(&level, element);
 
@@ -8176,6 +8349,8 @@ static void CopyElementPropertiesToEditor(int element)
     CopyCustomElementPropertiesToEditor(element);
   else if (IS_GROUP_ELEMENT(element))
     CopyGroupElementPropertiesToEditor(element);
+  else if (IS_EMPTY_ELEMENT(element))
+    CopyEmptyElementPropertiesToEditor(element);
   else
     CopyClassicElementPropertiesToEditor(element);
 }
@@ -8263,6 +8438,7 @@ static void CopyCustomElementPropertiesToGame(int element)
   // ---------- element settings: advanced (custom elements) ------------------
 
   // set player change event from checkbox and selectbox
+  custom_element_change_events[CE_NEXT_TO_PLAYER] = FALSE;
   custom_element_change_events[CE_TOUCHED_BY_PLAYER] = FALSE;
   custom_element_change_events[CE_PRESSED_BY_PLAYER] = FALSE;
   custom_element_change_events[CE_SWITCHED_BY_PLAYER] = FALSE;
@@ -8281,10 +8457,13 @@ static void CopyCustomElementPropertiesToGame(int element)
   custom_element_change_events[CE_SCORE_CHANGES] = FALSE;
   custom_element_change_events[CE_VALUE_GETS_ZERO] = FALSE;
   custom_element_change_events[CE_SCORE_GETS_ZERO] = FALSE;
+  custom_element_change_events[CE_CLICKED_BY_MOUSE] = FALSE;
+  custom_element_change_events[CE_PRESSED_BY_MOUSE] = FALSE;
   custom_element_change_events[custom_element_change.direct_action] =
     custom_element_change_events[CE_BY_DIRECT_ACTION];
 
   // set other element action change event from checkbox and selectbox
+  custom_element_change_events[CE_PLAYER_NEXT_TO_X] = FALSE;
   custom_element_change_events[CE_PLAYER_TOUCHES_X] = FALSE;
   custom_element_change_events[CE_PLAYER_PRESSES_X] = FALSE;
   custom_element_change_events[CE_PLAYER_SWITCHES_X] = FALSE;
@@ -8295,6 +8474,7 @@ static void CopyCustomElementPropertiesToGame(int element)
   custom_element_change_events[CE_PLAYER_DIGS_X] = FALSE;
   custom_element_change_events[CE_PLAYER_COLLECTS_X] = FALSE;
   custom_element_change_events[CE_PLAYER_DROPS_X] = FALSE;
+  custom_element_change_events[CE_NEXT_TO_X] = FALSE;
   custom_element_change_events[CE_TOUCHING_X] = FALSE;
   custom_element_change_events[CE_HITTING_X] = FALSE;
   custom_element_change_events[CE_DIGGING_X] = FALSE;
@@ -8308,6 +8488,8 @@ static void CopyCustomElementPropertiesToGame(int element)
   custom_element_change_events[CE_SCORE_CHANGES_OF_X] = FALSE;
   custom_element_change_events[CE_VALUE_GETS_ZERO_OF_X] = FALSE;
   custom_element_change_events[CE_SCORE_GETS_ZERO_OF_X] = FALSE;
+  custom_element_change_events[CE_MOUSE_CLICKED_ON_X] = FALSE;
+  custom_element_change_events[CE_MOUSE_PRESSED_ON_X] = FALSE;
   custom_element_change_events[custom_element_change.other_action] =
     custom_element_change_events[CE_BY_OTHER_ACTION];
 
@@ -8320,6 +8502,9 @@ static void CopyCustomElementPropertiesToGame(int element)
   // copy change events also to special level editor variable
   custom_element = element_info[element];
   custom_element_change = *element_info[element].change;
+
+  // needed here to restore runtime value "element_info[element].gfx_element"
+  InitElementPropertiesGfxElement();
 }
 
 static void CopyGroupElementPropertiesToGame(int element)
@@ -8333,11 +8518,29 @@ static void CopyGroupElementPropertiesToGame(int element)
 
   element_info[element] = custom_element;
   *element_info[element].group = group_element_info;
+
+  // needed here to restore runtime value "element_info[element].gfx_element"
+  InitElementPropertiesGfxElement();
+}
+
+static void CopyEmptyElementPropertiesToGame(int element)
+{
+  // mark that this empty element has been modified
+  custom_element.modified_settings = TRUE;
+  level.changed = TRUE;
+
+  if (level.use_custom_template)
+    AskToCopyAndModifyLevelTemplate();
+
+  element_info[element] = custom_element;
+
+  // needed here to restore runtime value "element_info[element].gfx_element"
+  InitElementPropertiesGfxElement();
 }
 
 static void CopyClassicElementPropertiesToGame(int element)
 {
-  if (ELEM_IS_PLAYER(element) || COULD_MOVE_INTO_ACID(element))
+  if (IS_PLAYER_ELEMENT(element) || COULD_MOVE_INTO_ACID(element))
     setMoveIntoAcidProperty(&level, element,
                            custom_element_properties[EP_CAN_MOVE_INTO_ACID]);
 
@@ -8352,6 +8555,8 @@ static void CopyElementPropertiesToGame(int element)
     CopyCustomElementPropertiesToGame(element);
   else if (IS_GROUP_ELEMENT(element))
     CopyGroupElementPropertiesToGame(element);
+  else if (IS_EMPTY_ELEMENT(element))
+    CopyEmptyElementPropertiesToGame(element);
   else
     CopyClassicElementPropertiesToGame(element);
 }
@@ -8363,8 +8568,7 @@ static void CheckElementDescriptions(void)
 
   for (i = 0; i < NUM_FILE_ELEMENTS; i++)
     if (getElementDescriptionFilename(i) == NULL && !IS_OBSOLETE(i))
-      Error(ERR_WARN, "no element description file for element '%s'",
-           EL_NAME(i));
+      Warn("no element description file for element '%s'", EL_NAME(i));
 }
 #endif
 
@@ -8397,6 +8601,9 @@ static void InitZoomLevelSettings(int zoom_tilesize)
     ed_tilesize = setup.auto_setup.editor_zoom_tilesize;
     ed_tilesize_default = DEFAULT_EDITOR_TILESIZE;
 
+    // make sure that tile size is always a power of 2
+    ed_tilesize = (1 << log_2(ed_tilesize));
+
     if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
     {
       ed_tilesize = DEFAULT_EDITOR_TILESIZE_MM;
@@ -8498,29 +8705,31 @@ static boolean useEditorDoorAnimation(void)
   return (door_1_viewport_unchanged && door_1_contains_toolbox);
 }
 
+static void DrawEditorDoorBackground(int graphic, int x, int y,
+                                    int width, int height)
+{
+  struct GraphicInfo *g = &graphic_info[graphic];
+
+  if (g->bitmap != NULL)
+    BlitBitmap(g->bitmap, drawto, g->src_x, g->src_y,
+              MIN(width, g->width), MIN(height, g->height), x, y);
+  else
+    ClearRectangle(drawto, x, y, width, height);
+}
+
 static void DrawEditorDoorContent(void)
 {
   // needed for gadgets drawn on background (like palette scrollbar)
   SetDoorBackgroundImage(IMG_UNDEFINED);
 
   // copy default editor door content to main double buffer
-  BlitBitmap(graphic_info[IMG_BACKGROUND_PALETTE].bitmap, drawto,
-            graphic_info[IMG_BACKGROUND_PALETTE].src_x,
-            graphic_info[IMG_BACKGROUND_PALETTE].src_y,
-            MIN(DXSIZE, graphic_info[IMG_BACKGROUND_PALETTE].width),
-            MIN(DYSIZE, graphic_info[IMG_BACKGROUND_PALETTE].height),
-            DX, DY);
+  DrawEditorDoorBackground(IMG_BACKGROUND_PALETTE, DX, DY, DXSIZE, DYSIZE);
 
   // draw bigger door
   DrawSpecialEditorDoor();
 
   // draw new control window
-  BlitBitmap(graphic_info[IMG_BACKGROUND_TOOLBOX].bitmap, drawto,
-            graphic_info[IMG_BACKGROUND_TOOLBOX].src_x,
-            graphic_info[IMG_BACKGROUND_TOOLBOX].src_y,
-            MIN(EXSIZE, graphic_info[IMG_BACKGROUND_TOOLBOX].width),
-            MIN(EYSIZE, graphic_info[IMG_BACKGROUND_TOOLBOX].height),
-            EX, EY);
+  DrawEditorDoorBackground(IMG_BACKGROUND_TOOLBOX, EX, EY, EXSIZE, EYSIZE);
 
   // draw all toolbox gadgets to editor doors
   MapControlButtons();
@@ -8539,7 +8748,7 @@ void DrawLevelEd(void)
 
   FadeSoundsAndMusic();
 
-  if (CheckIfGlobalBorderOrPlayfieldViewportHasChanged())
+  if (CheckFadeAll())
     fade_mask = REDRAW_ALL;
 
   FadeOut(fade_mask);
@@ -8559,8 +8768,8 @@ void DrawLevelEd(void)
 
   if (level_editor_test_game)
   {
-    CopyPlayfield(level.field, Feld);
-    CopyPlayfield(FieldBackup, level.field);
+    CopyPlayfield(level.field, Tile);
+    CopyPlayfield(TileBackup, level.field);
 
     level_editor_test_game = FALSE;
   }
@@ -9003,7 +9212,7 @@ static void DrawPropertiesTabulatorGadgets(void)
   int i;
 
   // draw two config tabulators for player elements
-  if (ELEM_IS_PLAYER(properties_element))
+  if (IS_PLAYER_ELEMENT(properties_element))
     id_last = ED_TEXTBUTTON_ID_PROPERTIES_CONFIG_2;
 
   // draw two config and one "change" tabulator for custom elements
@@ -9018,7 +9227,7 @@ static void DrawPropertiesTabulatorGadgets(void)
 
     // use "config 1" and "config 2" instead of "config" for players and CEs
     if (i == ED_TEXTBUTTON_ID_PROPERTIES_CONFIG &&
-       (ELEM_IS_PLAYER(properties_element) ||
+       (IS_PLAYER_ELEMENT(properties_element) ||
         IS_CUSTOM_ELEMENT(properties_element)))
       continue;
 
@@ -9505,7 +9714,7 @@ static void DrawPropertiesInfo(void)
   num_elements_in_level = 0;
   for (y = 0; y < lev_fieldy; y++) 
     for (x = 0; x < lev_fieldx; x++)
-      if (Feld[x][y] == properties_element)
+      if (Tile[x][y] == properties_element)
        num_elements_in_level++;
   percentage = num_elements_in_level * 100.0 / (lev_fieldx * lev_fieldy);
 
@@ -9691,6 +9900,8 @@ static struct
   { EL_EMC_LENSES,     &level.lenses_score,            TEXT_COLLECTING },
   { EL_EMC_MAGNIFIER,  &level.magnify_score,           TEXT_COLLECTING },
   { EL_SPRING,         &level.slurp_score,             TEXT_SLURPING   },
+  { EL_SPRING_LEFT,    &level.slurp_score,             TEXT_SLURPING   },
+  { EL_SPRING_RIGHT,   &level.slurp_score,             TEXT_SLURPING   },
   { EL_EMC_LENSES,     &level.lenses_time,             TEXT_DURATION   },
   { EL_EMC_MAGNIFIER,  &level.magnify_time,            TEXT_DURATION   },
   { EL_MM_FUSE_ACTIVE, &level.mm_time_fuse,            TEXT_DELAY_OFF  },
@@ -9709,11 +9920,12 @@ static boolean checkPropertiesConfig(int element)
   if (IS_GEM(element) ||
       IS_CUSTOM_ELEMENT(element) ||
       IS_GROUP_ELEMENT(element) ||
+      IS_EMPTY_ELEMENT(element) ||
       IS_BALLOON_ELEMENT(element) ||
       IS_ENVELOPE(element) ||
       IS_MM_MCDUFFIN(element) ||
       IS_DF_LASER(element) ||
-      ELEM_IS_PLAYER(element) ||
+      IS_PLAYER_ELEMENT(element) ||
       HAS_EDITOR_CONTENT(element) ||
       CAN_GROW(element) ||
       COULD_MOVE_INTO_ACID(element) ||
@@ -9743,12 +9955,45 @@ static void SetAutomaticNumberOfGemsNeeded(void)
   {
     for (y = 0; y < lev_fieldy; y++)
     {
-      int element = Feld[x][y];
+      int element = Tile[x][y];
+
+      switch (element)
+      {
+       case EL_EMERALD:
+       case EL_EMERALD_YELLOW:
+       case EL_EMERALD_RED:
+       case EL_EMERALD_PURPLE:
+       case EL_BD_DIAMOND:
+       case EL_WALL_EMERALD:
+       case EL_WALL_EMERALD_YELLOW:
+       case EL_WALL_EMERALD_RED:
+       case EL_WALL_EMERALD_PURPLE:
+       case EL_WALL_BD_DIAMOND:
+       case EL_NUT:
+       case EL_SP_INFOTRON:
+       case EL_MM_KETTLE:
+       case EL_DF_CELL:
+         level.gems_needed++;
+         break;
+
+       case EL_DIAMOND:
+       case EL_WALL_DIAMOND:
+         level.gems_needed += 3;
+         break;
+
+       case EL_PEARL:
+       case EL_WALL_PEARL:
+         level.gems_needed += 5;
+         break;
+
+       case EL_CRYSTAL:
+       case EL_WALL_CRYSTAL:
+         level.gems_needed += 8;
+         break;
 
-      if (IS_GEM(element) ||
-         element == EL_MM_KETTLE ||
-         element == EL_DF_CELL)
-       level.gems_needed++;
+       default:
+         break;
+      }
     }
   }
 
@@ -9831,13 +10076,13 @@ static void DrawPropertiesConfig(void)
       DrawMagicBallContentAreas();
 
       MapCheckbuttonGadget(ED_CHECKBUTTON_ID_RANDOM_BALL_CONTENT);
-      MapCheckbuttonGadget(ED_CHECKBUTTON_ID_INITIAL_BALL_STATE);
+      MapCheckbuttonGadget(ED_CHECKBUTTON_ID_INITIAL_BALL_ACTIVE);
     }
     else if (properties_element == EL_EMC_ANDROID)
       DrawAndroidElementArea(properties_element);
   }
 
-  if (ELEM_IS_PLAYER(properties_element))
+  if (IS_PLAYER_ELEMENT(properties_element))
   {
     int player_nr = GET_PLAYER_NR(properties_element);
 
@@ -9899,6 +10144,8 @@ static void DrawPropertiesConfig(void)
 
       // draw checkbutton gadgets
       MapCheckbuttonGadget(ED_CHECKBUTTON_ID_USE_INITIAL_INVENTORY);
+      MapCheckbuttonGadget(ED_CHECKBUTTON_ID_FINISH_DIG_COLLECT);
+      MapCheckbuttonGadget(ED_CHECKBUTTON_ID_KEEP_WALKABLE_CE);
 
       // draw counter gadgets
       MapCounterButtons(ED_COUNTER_ID_INVENTORY_SIZE);
@@ -9915,7 +10162,7 @@ static void DrawPropertiesConfig(void)
     MapCheckbuttonGadget(ED_CHECKBUTTON_ID_EM_EXPLODES_BY_FIRE);
 
   if (COULD_MOVE_INTO_ACID(properties_element) &&
-      !ELEM_IS_PLAYER(properties_element) &&
+      !IS_PLAYER_ELEMENT(properties_element) &&
       (!IS_CUSTOM_ELEMENT(properties_element) ||
        edit_mode_properties == ED_MODE_PROPERTIES_CONFIG_2))
   {
@@ -9923,7 +10170,7 @@ static void DrawPropertiesConfig(void)
     checkbutton_info[ED_CHECKBUTTON_ID_CAN_MOVE_INTO_ACID].x =
       ED_ELEMENT_SETTINGS_XPOS(IS_CUSTOM_ELEMENT(properties_element) ? 1 : 0);
     checkbutton_info[ED_CHECKBUTTON_ID_CAN_MOVE_INTO_ACID].y =
-      ED_ELEMENT_SETTINGS_YPOS(IS_CUSTOM_ELEMENT(properties_element) ? 6 :
+      ED_ELEMENT_SETTINGS_YPOS(IS_CUSTOM_ELEMENT(properties_element) ? 7 :
                               IS_BALLOON_ELEMENT(properties_element) ||
                               HAS_EDITOR_CONTENT(properties_element) ? 1 : 0);
 
@@ -9933,7 +10180,9 @@ static void DrawPropertiesConfig(void)
   if (MAYBE_DONT_COLLIDE_WITH(properties_element))
     MapCheckbuttonGadget(ED_CHECKBUTTON_ID_DONT_COLLIDE_WITH);
 
-  if (properties_element == EL_SPRING)
+  if (properties_element == EL_SPRING ||
+      properties_element == EL_SPRING_LEFT ||
+      properties_element == EL_SPRING_RIGHT)
     MapCheckbuttonGadget(ED_CHECKBUTTON_ID_USE_SPRING_BUG);
 
   if (properties_element == EL_TIME_ORB_FULL)
@@ -10095,6 +10344,23 @@ static void DrawPropertiesConfig(void)
 
     draw_footer_line = TRUE;
   }
+  else if (IS_EMPTY_ELEMENT(properties_element))
+  {
+    // draw stickybutton gadget
+    MapCheckbuttonGadget(ED_CHECKBUTTON_ID_STICK_ELEMENT);
+
+    // draw checkbutton gadgets
+    MapCheckbuttonGadget(ED_CHECKBUTTON_ID_CUSTOM_USE_GRAPHIC);
+    MapCheckbuttonGadget(ED_CHECKBUTTON_ID_CUSTOM_USE_TEMPLATE_1);
+
+    // draw textbutton gadgets
+    MapTextbuttonGadget(ED_TEXTBUTTON_ID_SAVE_AS_TEMPLATE_1);
+
+    // draw drawing area gadgets
+    MapDrawingArea(ED_DRAWING_ID_CUSTOM_GRAPHIC);
+
+    draw_footer_line = TRUE;
+  }
 
   // draw little footer border line above CE/GE use/save template gadgets
   if (draw_footer_line)
@@ -10251,12 +10517,12 @@ static void DrawPropertiesWindow(void)
     edit_mode_properties = ED_MODE_PROPERTIES_CONFIG_2;
 
   if (edit_mode_properties > ED_MODE_PROPERTIES_CONFIG &&
-      !ELEM_IS_PLAYER(properties_element) &&
+      !IS_PLAYER_ELEMENT(properties_element) &&
       !IS_CUSTOM_ELEMENT(properties_element))
     edit_mode_properties = ED_MODE_PROPERTIES_CONFIG;
 
   if (edit_mode_properties == ED_MODE_PROPERTIES_CONFIG &&
-      (ELEM_IS_PLAYER(properties_element) ||
+      (IS_PLAYER_ELEMENT(properties_element) ||
        IS_CUSTOM_ELEMENT(properties_element)))
     edit_mode_properties = ED_MODE_PROPERTIES_CONFIG_1;
 
@@ -10577,13 +10843,7 @@ static int getChipFromOpenDirectionNotEmpty(int direction, int element_old)
 
 static int getClosedTube(int x, int y)
 {
-  static int xy[4][2] =
-  {
-    { -1, 0 },
-    { +1, 0 },
-    { 0, -1 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_directions;
   int element_old = IntelliDrawBuffer[x][y];
   int direction_old = getOpenDirectionFromTube(element_old);
   int direction_new = MV_NONE;
@@ -10591,8 +10851,8 @@ static int getClosedTube(int x, int y)
 
   for (i = 0; i < NUM_DIRECTIONS; i++)
   {
-    int xx = x + xy[i][0];
-    int yy = y + xy[i][1];
+    int xx = x + xy[i].x;
+    int yy = y + xy[i].y;
     int dir = MV_DIR_FROM_BIT(i);
     int dir_opposite = MV_DIR_OPPOSITE(dir);
 
@@ -10607,13 +10867,7 @@ static int getClosedTube(int x, int y)
 
 static int getClosedBelt(int x, int y)
 {
-  static int xy[4][2] =
-  {
-    { -1, 0 },
-    { +1, 0 },
-    { 0, -1 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_directions;
   int element_old = IntelliDrawBuffer[x][y];
   int nr = getBeltNrFromBeltElement(element_old);
   int direction_old = getOpenDirectionFromBelt(element_old);
@@ -10622,8 +10876,8 @@ static int getClosedBelt(int x, int y)
 
   for (i = MV_BIT_LEFT; i <= MV_BIT_RIGHT; i++)
   {
-    int xx = x + xy[i][0];
-    int yy = y + xy[i][1];
+    int xx = x + xy[i].x;
+    int yy = y + xy[i].y;
     int dir = MV_DIR_FROM_BIT(i);
     int dir_opposite = MV_DIR_OPPOSITE(dir);
 
@@ -10638,13 +10892,7 @@ static int getClosedBelt(int x, int y)
 
 static int getClosedPool(int x, int y)
 {
-  static int xy[4][2] =
-  {
-    { -1, 0 },
-    { +1, 0 },
-    { 0, -1 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_directions;
   int element_old = IntelliDrawBuffer[x][y];
   int direction_old = getOpenDirectionFromPool(element_old);
   int direction_new = MV_NONE;
@@ -10652,8 +10900,8 @@ static int getClosedPool(int x, int y)
 
   for (i = 0; i < NUM_DIRECTIONS; i++)
   {
-    int xx = x + xy[i][0];
-    int yy = y + xy[i][1];
+    int xx = x + xy[i].x;
+    int yy = y + xy[i].y;
     int dir = MV_DIR_FROM_BIT(i);
     int dir_opposite = MV_DIR_OPPOSITE(dir);
 
@@ -10669,13 +10917,7 @@ static int getClosedPool(int x, int y)
 
 static int getClosedPillar(int x, int y)
 {
-  static int xy[4][2] =
-  {
-    { -1, 0 },
-    { +1, 0 },
-    { 0, -1 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_directions;
   int element_old = IntelliDrawBuffer[x][y];
   int direction_old = getOpenDirectionFromPillar(element_old);
   int direction_new = MV_NONE;
@@ -10683,8 +10925,8 @@ static int getClosedPillar(int x, int y)
 
   for (i = MV_BIT_UP; i <= MV_BIT_DOWN; i++)
   {
-    int xx = x + xy[i][0];
-    int yy = y + xy[i][1];
+    int xx = x + xy[i].x;
+    int yy = y + xy[i].y;
     int dir = MV_DIR_FROM_BIT(i);
     int dir_opposite = MV_DIR_OPPOSITE(dir);
 
@@ -10699,13 +10941,7 @@ static int getClosedPillar(int x, int y)
 
 static int getClosedSteel2(int x, int y)
 {
-  static int xy[4][2] =
-  {
-    { -1, 0 },
-    { +1, 0 },
-    { 0, -1 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_directions;
   int element_old = IntelliDrawBuffer[x][y];
   int direction_old = getOpenDirectionFromSteel2(element_old);
   int direction_new = MV_NONE;
@@ -10713,8 +10949,8 @@ static int getClosedSteel2(int x, int y)
 
   for (i = 0; i < NUM_DIRECTIONS; i++)
   {
-    int xx = x + xy[i][0];
-    int yy = y + xy[i][1];
+    int xx = x + xy[i].x;
+    int yy = y + xy[i].y;
     int dir = MV_DIR_FROM_BIT(i);
     int dir_opposite = MV_DIR_OPPOSITE(dir);
 
@@ -10729,13 +10965,7 @@ static int getClosedSteel2(int x, int y)
 
 static int getClosedChip(int x, int y)
 {
-  static int xy[4][2] =
-  {
-    { -1, 0 },
-    { +1, 0 },
-    { 0, -1 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_directions;
   int element_old = IntelliDrawBuffer[x][y];
   int direction_old = getOpenDirectionFromChip(element_old);
   int direction_new = MV_NONE;
@@ -10743,8 +10973,8 @@ static int getClosedChip(int x, int y)
 
   for (i = 0; i < NUM_DIRECTIONS; i++)
   {
-    int xx = x + xy[i][0];
-    int yy = y + xy[i][1];
+    int xx = x + xy[i].x;
+    int yy = y + xy[i].y;
     int dir = MV_DIR_FROM_BIT(i);
     int dir_opposite = MV_DIR_OPPOSITE(dir);
 
@@ -10762,7 +10992,7 @@ static void SetElementSimpleExt(int x, int y, int dx, int dy, int element,
 {
   int sx = x - level_xpos;
   int sy = y - level_ypos;
-  int old_element = Feld[x][y];
+  int old_element = Tile[x][y];
   int new_element = element;
   unsigned int new_bitmask = (getDrawModeHiRes() ? (dx + 1) << (dy * 2) : 0x0f);
   boolean draw_masked = FALSE;
@@ -10788,7 +11018,7 @@ static void SetElementSimpleExt(int x, int y, int dx, int dy, int element,
   IntelliDrawBuffer[x][y] = element;
 
   if (change_level)
-    Feld[x][y] = element;
+    Tile[x][y] = element;
 
   if (IN_ED_FIELD(sx, sy))
   {
@@ -10827,16 +11057,9 @@ static void MergeAndCloseNeighbourElements(int x1, int y1, int *element1,
 static void SetElementIntelliDraw(int x, int y, int new_element,
                                  boolean change_level, int button)
 {
-  static int xy[4][2] =
-  {
-    { -1, 0 },
-    { +1, 0 },
-    { 0, -1 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_directions;
   static int last_x = -1;
   static int last_y = -1;
-  int old_element = IntelliDrawBuffer[x][y];
 
   if (new_element == EL_UNDEFINED)
   {
@@ -10846,6 +11069,8 @@ static void SetElementIntelliDraw(int x, int y, int new_element,
     return;
   }
 
+  int old_element = IntelliDrawBuffer[x][y];
+
   if (IS_TUBE(new_element))
   {
     int last_element_new = EL_UNDEFINED;
@@ -10858,8 +11083,8 @@ static void SetElementIntelliDraw(int x, int y, int new_element,
 
     for (i = 0; i < NUM_DIRECTIONS; i++)
     {
-      int xx = x + xy[i][0];
-      int yy = y + xy[i][1];
+      int xx = x + xy[i].x;
+      int yy = y + xy[i].y;
 
       if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
          IS_TUBE(IntelliDrawBuffer[last_x][last_y]))
@@ -10896,8 +11121,8 @@ static void SetElementIntelliDraw(int x, int y, int new_element,
 
     for (i = MV_BIT_LEFT; i <= MV_BIT_RIGHT; i++)
     {
-      int xx = x + xy[i][0];
-      int yy = y + xy[i][1];
+      int xx = x + xy[i].x;
+      int yy = y + xy[i].y;
 
       if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
          IS_BELT(IntelliDrawBuffer[last_x][last_y]))
@@ -10934,8 +11159,8 @@ static void SetElementIntelliDraw(int x, int y, int new_element,
 
     for (i = 0; i < NUM_DIRECTIONS; i++)
     {
-      int xx = x + xy[i][0];
-      int yy = y + xy[i][1];
+      int xx = x + xy[i].x;
+      int yy = y + xy[i].y;
 
       if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
          IS_ACID_POOL_OR_ACID(IntelliDrawBuffer[last_x][last_y]))
@@ -10977,8 +11202,8 @@ static void SetElementIntelliDraw(int x, int y, int new_element,
 
     for (i = MV_BIT_UP; i <= MV_BIT_DOWN; i++)
     {
-      int xx = x + xy[i][0];
-      int yy = y + xy[i][1];
+      int xx = x + xy[i].x;
+      int yy = y + xy[i].y;
 
       if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
          IS_EMC_PILLAR(IntelliDrawBuffer[last_x][last_y]))
@@ -11014,8 +11239,8 @@ static void SetElementIntelliDraw(int x, int y, int new_element,
 
     for (i = 0; i < NUM_DIRECTIONS; i++)
     {
-      int xx = x + xy[i][0];
-      int yy = y + xy[i][1];
+      int xx = x + xy[i].x;
+      int yy = y + xy[i].y;
 
       if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
          IS_DC_STEELWALL_2(IntelliDrawBuffer[last_x][last_y]))
@@ -11049,8 +11274,8 @@ static void SetElementIntelliDraw(int x, int y, int new_element,
 
     for (i = 0; i < NUM_DIRECTIONS; i++)
     {
-      int xx = x + xy[i][0];
-      int yy = y + xy[i][1];
+      int xx = x + xy[i].x;
+      int yy = y + xy[i].y;
 
       if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
          IS_SP_CHIP(IntelliDrawBuffer[last_x][last_y]))
@@ -11110,8 +11335,8 @@ static void SetElementIntelliDraw(int x, int y, int new_element,
 
     for (i = 0; i < NUM_DIRECTIONS; i++)
     {
-      int xx = x + xy[i][0];
-      int yy = y + xy[i][1];
+      int xx = x + xy[i].x;
+      int yy = y + xy[i].y;
 
       if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
          IS_IN_GROUP_EL(IntelliDrawBuffer[last_x][last_y], new_element))
@@ -11613,18 +11838,28 @@ static void ResetIntelliDraw(void)
 
   for (x = 0; x < lev_fieldx; x++)
     for (y = 0; y < lev_fieldy; y++)
-      IntelliDrawBuffer[x][y] = Feld[x][y];
+      IntelliDrawBuffer[x][y] = Tile[x][y];
 
   SetElementIntelliDraw(-1, -1, EL_UNDEFINED, FALSE, -1);
 }
 
 static boolean draw_mode_hires = FALSE;
 
+static boolean isHiresTileElement(int element)
+{
+  return (IS_MM_WALL(element)        || element == EL_EMPTY);
+}
+
+static boolean isHiresDrawElement(int element)
+{
+  return (IS_MM_WALL_EDITOR(element) || element == EL_EMPTY);
+}
+
 static void SetDrawModeHiRes(int element)
 {
   draw_mode_hires =
     (level.game_engine_type == GAME_ENGINE_TYPE_MM &&
-     (IS_MM_WALL_EDITOR(element) || element == EL_EMPTY));
+     isHiresDrawElement(element));
 }
 
 static boolean getDrawModeHiRes(void)
@@ -11646,7 +11881,7 @@ static void SetElementExt(int x, int y, int dx, int dy, int element,
                          boolean change_level, int button)
 {
   if (element < 0)
-    SetElementSimple(x, y, Feld[x][y], change_level);
+    SetElementSimple(x, y, Tile[x][y], change_level);
   else if (GetKeyModState() & KMOD_Shift && !IS_MM_WALL_EDITOR(element))
     SetElementIntelliDraw(x, y, element, change_level, button);
   else
@@ -11690,7 +11925,7 @@ static int getLevelElementHiRes(int lx2, int ly2)
   int ly = ly2 / 2;
   int dx = lx2 % 2;
   int dy = ly2 % 2;
-  int element = Feld[lx][ly];
+  int element = Tile[lx][ly];
   unsigned int bitmask = (dx + 1) << (dy * 2);
 
   if (IS_MM_WALL(element))
@@ -11942,27 +12177,28 @@ static void CopyBrushExt(int from_x, int from_y, int to_x, int to_y,
     char text[MAX_CB_TEXT_SIZE + 1] = "";
     int width  = (draw_with_brush ? brush_width  : lev_fieldx);
     int height = (draw_with_brush ? brush_height : lev_fieldy);
+    char *format = "%s%03d";
+
+    for (y = 0; y < height; y++)
+      for (x = 0; x < width; x++)
+       if ((draw_with_brush ? brush_buffer[x][y] : Tile[x][y]) > 999)
+         format = "%s%04d";
 
     for (y = 0; y < height; y++)
     {
       for (x = 0; x < width; x++)
       {
-       int element = (draw_with_brush ? brush_buffer[x][y] : Feld[x][y]);
-       int element_mapped = element;
+       int element = (draw_with_brush ? brush_buffer[x][y] : Tile[x][y]);
        char *prefix = (mode == CB_DUMP_BRUSH ||
                        mode == CB_BRUSH_TO_CLIPBOARD ? "`" : "¸");
 
-       if (IS_CUSTOM_ELEMENT(element))
-         element_mapped = EL_CUSTOM_START;
-       else if (IS_GROUP_ELEMENT(element))
-         element_mapped = EL_GROUP_START;
-       else if (element >= NUM_FILE_ELEMENTS)
-         element_mapped = EL_UNKNOWN;
+       if (element >= NUM_FILE_ELEMENTS)
+         element = EL_UNKNOWN;
 
        // copy brush to level sketch text buffer for the R'n'D forum:
-       // - large tiles: `xxx (0x60 ASCII)
-       // - small tiles: Â¸xxx (0xb8 ISO-8859-1, 0xc2b8 UTF-8)
-       snprintf(part, MAX_CB_PART_SIZE + 1, "%s%03d", prefix, element_mapped);
+       // - large tiles: `xxx or `xxxx (0x60 ASCII)
+       // - small tiles: Â¸xxx or Â¸xxxx (0xb8 ISO-8859-1, 0xc2b8 UTF-8)
+       snprintf(part, MAX_CB_PART_SIZE + 1, format, prefix, element);
        strcat(text, part);
       }
 
@@ -11973,7 +12209,7 @@ static void CopyBrushExt(int from_x, int from_y, int to_x, int to_y,
        mode == CB_BRUSH_TO_CLIPBOARD_SMALL)
       SDL_SetClipboardText(text);
     else
-      printf("%s", text);
+      Print("%s", text);       // print brush data to console and log file
 
     return;
   }
@@ -12009,11 +12245,13 @@ static void CopyBrushExt(int from_x, int from_y, int to_x, int to_y,
 
     char *clipboard_text = SDL_GetClipboardText();
     char *ptr = clipboard_text;
+    boolean allow_new_row = FALSE;
     boolean stop = FALSE;
 
     while (*ptr && !stop)
     {
       boolean prefix_found = FALSE;
+      boolean start_new_row = FALSE;
 
       // level sketch element number prefixes (may be multi-byte characters)
       char *prefix_list[] = { "`", "¸" };
@@ -12042,19 +12280,10 @@ static void CopyBrushExt(int from_x, int from_y, int to_x, int to_y,
        }
       }
 
-      // continue with next character if prefix not found
-      if (!prefix_found)
-      {
-       ptr++;          // !!! FIX THIS for real UTF-8 handling !!!
-
-       continue;
-      }
-
-      // continue with next character if prefix not found
-      if (strlen(ptr) < 3)
-       break;
-
-      if (ptr[0] >= '0' && ptr[0] <= '9' &&
+      // check if prefix found and followed by (at least) three digits
+      if (prefix_found &&
+         strlen(ptr) >= 3 &&
+         ptr[0] >= '0' && ptr[0] <= '9' &&
          ptr[1] >= '0' && ptr[1] <= '9' &&
          ptr[2] >= '0' && ptr[2] <= '9')
       {
@@ -12064,6 +12293,16 @@ static void CopyBrushExt(int from_x, int from_y, int to_x, int to_y,
 
        ptr += 3;
 
+       // level sketch element number might consist of four digits
+       if (ptr[0] >= '0' && ptr[0] <= '9')
+       {
+         element = element * 10 + (ptr[0] - '0');
+         ptr++;
+       }
+
+       // remap some (historic, now obsolete) elements
+       element = getMappedElement(element);
+
        if (element >= NUM_FILE_ELEMENTS)
          element = EL_UNKNOWN;
 
@@ -12074,14 +12313,28 @@ static void CopyBrushExt(int from_x, int from_y, int to_x, int to_y,
 
        x++;
 
-       if (x >= MAX_LEV_FIELDX || *ptr == '\n')
-       {
-         x = 0;
-         y++;
+       if (x >= MAX_LEV_FIELDX)
+         start_new_row = TRUE;
 
-         if (y >= MAX_LEV_FIELDY)
-           stop = TRUE;
-       }
+       allow_new_row = TRUE;
+      }
+      else
+      {
+       if ((*ptr == '\n' || *ptr == '\r') && allow_new_row)
+         start_new_row = TRUE;
+
+       ptr++;          // !!! FIX THIS for real UTF-8 handling !!!
+      }
+
+      if (start_new_row)
+      {
+       x = 0;
+       y++;
+
+       if (y >= MAX_LEV_FIELDY)
+         stop = TRUE;
+
+       allow_new_row = FALSE;
       }
     }
 
@@ -12120,11 +12373,41 @@ static void CopyBrushExt(int from_x, int from_y, int to_x, int to_y,
 
       for (x = 0; x < MAX_LEV_FIELDX; x++)
        for (y = 0; y < MAX_LEV_FIELDY; y++)
-         Feld[x][y] = brush_buffer[x][y];
+         Tile[x][y] = brush_buffer[x][y];
 
       lev_fieldx = level.fieldx = brush_width;
       lev_fieldy = level.fieldy = brush_height;
 
+      boolean use_em_engine = TRUE;
+      boolean use_sp_engine = TRUE;
+      boolean use_mm_engine = TRUE;
+
+      for (x = 0; x < MAX_LEV_FIELDX; x++)
+      {
+       for (y = 0; y < MAX_LEV_FIELDY; y++)
+       {
+         int element = Tile[x][y];
+
+         if (!IS_EM_ELEMENT(element) && !IS_PLAYER_ELEMENT(element))
+           use_em_engine = FALSE;
+
+         if (!IS_SP_ELEMENT(element))
+           use_sp_engine = FALSE;
+
+         if (!IS_MM_ELEMENT(element) && element != EL_EMPTY)
+           use_mm_engine = FALSE;
+       }
+      }
+
+      level.game_engine_type = (use_em_engine ? GAME_ENGINE_TYPE_EM :
+                               use_sp_engine ? GAME_ENGINE_TYPE_SP :
+                               use_mm_engine ? GAME_ENGINE_TYPE_MM :
+                               GAME_ENGINE_TYPE_RND);
+
+      // update element selection list
+      ReinitializeElementList();
+      ModifyEditorElementList();
+
       SetBorderElement();
 
       DrawEditModeWindow();
@@ -12157,7 +12440,7 @@ static void CopyBrushExt(int from_x, int from_y, int to_x, int to_y,
     {
       for (x = 0; x < brush_width; x++)
       {
-       brush_buffer[x][y] = Feld[from_lx + x][from_ly + y];
+       brush_buffer[x][y] = Tile[from_lx + x][from_ly + y];
 
        if (button != 1)
          DrawBrushElement(from_x + x, from_y + y, new_element, TRUE);
@@ -12286,9 +12569,19 @@ void CopyBrushToClipboard_Small(void)
   CopyBrushExt(0, 0, 0, 0, 0, CB_BRUSH_TO_CLIPBOARD_SMALL);
 }
 
+void UndoLevelEditorOperation(void)
+{
+  ClickOnGadget(level_editor_gadget[GADGET_ID_UNDO], -1);
+}
+
+void RedoLevelEditorOperation(void)
+{
+  ClickOnGadget(level_editor_gadget[GADGET_ID_UNDO], 3);
+}
+
 static void FloodFill(int from_x, int from_y, int fill_element)
 {
-  FloodFillLevel(from_x, from_y, fill_element, Feld, lev_fieldx, lev_fieldy);
+  FloodFillLevel(from_x, from_y, fill_element, Tile, lev_fieldx, lev_fieldy);
 }
 
 static void FloodFillWall_MM(int from_sx2, int from_sy2, int fill_element)
@@ -12297,20 +12590,20 @@ static void FloodFillWall_MM(int from_sx2, int from_sy2, int fill_element)
   int from_y = from_sy2 + 2 * level_ypos;
   int max_fillx = lev_fieldx * 2;
   int max_filly = lev_fieldy * 2;
-  short FillFeld[max_fillx][max_filly];
+  short Fill[max_fillx][max_filly];
   int x, y;
 
   for (x = 0; x < max_fillx; x++)
     for (y = 0; y < max_filly; y++)
-      FillFeld[x][y] = getLevelElementHiRes(x, y);
+      Fill[x][y] = getLevelElementHiRes(x, y);
 
   FloodFillLevelExt(from_x, from_y, fill_element, max_fillx, max_filly,
-                   FillFeld, max_fillx, max_filly);
+                   Fill, max_fillx, max_filly);
 
   for (x = 0; x < max_fillx; x++)
     for (y = 0; y < max_filly; y++)
-      if (FillFeld[x][y] == fill_element)
-       SetLevelElementHiRes(x, y, FillFeld[x][y]);
+      if (Fill[x][y] == fill_element)
+       SetLevelElementHiRes(x, y, Fill[x][y]);
 }
 
 // values for DrawLevelText() modes
@@ -12374,8 +12667,10 @@ static int DrawLevelText(int sx, int sy, char letter, int mode)
       break;
 
     case TEXT_SETCURSOR:
-      DrawEditorElement(last_sx, last_sy, Feld[lx][ly]);
+      DrawEditorElement(last_sx, last_sy, Tile[lx][ly]);
       DrawAreaBorder(sx, sy, sx, sy);
+      StartTextInput(SX + sx * ed_tilesize, SY + sy * ed_tilesize,
+                    ed_tilesize, ed_tilesize);
       last_sx = sx;
       last_sy = sy;
       break;
@@ -12387,8 +12682,8 @@ static int DrawLevelText(int sx, int sy, char letter, int mode)
            new_element1 <= EL_STEEL_CHAR_END)
          letter_element = letter_element - EL_CHAR_START + EL_STEEL_CHAR_START;
 
-       delete_buffer[sx - start_sx] = Feld[lx][ly];
-       Feld[lx][ly] = letter_element;
+       delete_buffer[sx - start_sx] = Tile[lx][ly];
+       Tile[lx][ly] = letter_element;
 
        if (sx + 1 < ed_fieldx && lx + 1 < lev_fieldx)
          DrawLevelText(sx + 1, sy, 0, TEXT_SETCURSOR);
@@ -12404,14 +12699,14 @@ static int DrawLevelText(int sx, int sy, char letter, int mode)
     case TEXT_BACKSPACE:
       if (sx > start_sx)
       {
-       Feld[lx - 1][ly] = delete_buffer[sx - start_sx - 1];
-       DrawEditorElement(sx - 1, sy, Feld[lx - 1][ly]);
+       Tile[lx - 1][ly] = delete_buffer[sx - start_sx - 1];
+       DrawEditorElement(sx - 1, sy, Tile[lx - 1][ly]);
        DrawLevelText(sx - 1, sy, 0, TEXT_SETCURSOR);
       }
       break;
 
     case TEXT_NEWLINE:
-      if (sy + 1 < ed_fieldy - 1 && ly + 1 < lev_fieldy - 1)
+      if (sy + 1 < ed_fieldy && ly + 1 < lev_fieldy)
        DrawLevelText(start_sx, sy + 1, 0, TEXT_SETCURSOR);
       else
        DrawLevelText(0, 0, 0, TEXT_END);
@@ -12419,7 +12714,8 @@ static int DrawLevelText(int sx, int sy, char letter, int mode)
 
     case TEXT_END:
       CopyLevelToUndoBuffer(UNDO_IMMEDIATE);
-      DrawEditorElement(sx, sy, Feld[lx][ly]);
+      DrawEditorElement(sx, sy, Tile[lx][ly]);
+      StopTextInput();
       typing = FALSE;
       break;
 
@@ -12440,7 +12736,7 @@ static void SetTextCursor(int unused_sx, int unused_sy, int sx, int sy,
   int ly = sy + level_ypos;
 
   if (element == -1)
-    DrawEditorElement(sx, sy, Feld[lx][ly]);
+    DrawEditorElement(sx, sy, Tile[lx][ly]);
   else
     DrawAreaBorder(sx, sy, sx, sy);
 }
@@ -12494,7 +12790,7 @@ static void CopyLevelToUndoBuffer(int mode)
 
   for (x = 0; x < lev_fieldx; x++)
     for (y = 0; y < lev_fieldy; y++)
-      UndoBuffer[undo_buffer_position][x][y] = Feld[x][y];
+      UndoBuffer[undo_buffer_position][x][y] = Tile[x][y];
 
   // check if drawing operation forces change of border style
   CheckLevelBorderElement(TRUE);
@@ -12516,8 +12812,8 @@ static void RandomPlacement(int new_element)
   {
     free_position[x][y] =
       (random_placement_background_restricted ?
-       Feld[x][y] == random_placement_background_element :
-       Feld[x][y] != new_element);
+       Tile[x][y] == random_placement_background_element :
+       Tile[x][y] != new_element);
 
     if (free_position[x][y])
       num_free_positions++;
@@ -12565,17 +12861,54 @@ static void WrapLevel(int dx, int dy)
 
   for (x = 0; x < lev_fieldx; x++)
     for (y = 0; y < lev_fieldy; y++)
-      FieldBackup[x][y] = Feld[x][y];
+      TileBackup[x][y] = Tile[x][y];
 
   for (x = 0; x < lev_fieldx; x++)
     for (y = 0; y < lev_fieldy; y++)
-      Feld[x][y] =
-       FieldBackup[(x + wrap_dx) % lev_fieldx][(y + wrap_dy) % lev_fieldy];
+      Tile[x][y] =
+       TileBackup[(x + wrap_dx) % lev_fieldx][(y + wrap_dy) % lev_fieldy];
 
   DrawEditorLevel(ed_fieldx, ed_fieldy, level_xpos, level_ypos);
   CopyLevelToUndoBuffer(UNDO_ACCUMULATE);
 }
 
+static void DrawAreaElementHighlight(boolean highlighted)
+{
+  DrawEditorLevel(ed_fieldx, ed_fieldy, level_xpos, level_ypos);
+
+  if (!highlighted)
+    return;
+
+  int x, y;
+
+  for (x = 0; x < ed_fieldx; x++)
+  {
+    for (y = 0; y < ed_fieldy; y++)
+    {
+      int lx = x + level_xpos;
+      int ly = y + level_ypos;
+
+      if (!IN_LEV_FIELD(lx, ly))
+       continue;
+
+      if (Tile[lx][ly] != new_element1)
+       continue;
+
+      int sx = SX + x * ed_tilesize;
+      int sy = SY + y * ed_tilesize;
+      int from_sx = sx;
+      int from_sy = sy;
+      int to_sx = sx + ed_tilesize - 1;
+      int to_sy = sy + ed_tilesize - 1;
+
+      DrawSimpleWhiteLine(drawto, from_sx, from_sy, to_sx,   from_sy);
+      DrawSimpleWhiteLine(drawto, to_sx,   from_sy, to_sx,   to_sy);
+      DrawSimpleWhiteLine(drawto, to_sx,   to_sy,   from_sx, to_sy);
+      DrawSimpleWhiteLine(drawto, from_sx, to_sy,   from_sx, from_sy);
+    }
+  }
+}
+
 static void CopyLevelTemplateToUserLevelSet(char *levelset_subdir)
 {
   char *template_filename_old = getLocalLevelTemplateFilename();
@@ -12662,9 +12995,13 @@ static void HandleDrawingAreas(struct GadgetInfo *gi)
   }
   else if (!button_press_event)
   {
+    int old_element = (IN_LEV_FIELD(lx, ly) ? Tile[lx][ly] : EL_UNDEFINED);
+    boolean hires_drawing = (level.game_engine_type == GAME_ENGINE_TYPE_MM &&
+                            isHiresTileElement(old_element) &&
+                            isHiresDrawElement(new_element));
+
     // prevent handling events for every pixel position when moving mouse
-    if ((sx == last_sx && sy == last_sy &&
-        !IS_MM_WALL_EDITOR(new_element) && new_element != EL_EMPTY) ||
+    if ((sx == last_sx && sy == last_sy && !hires_drawing) ||
        (sx2 == last_sx2 && sy2 == last_sy2))
       return;
   }
@@ -12734,13 +13071,37 @@ static void HandleDrawingAreas(struct GadgetInfo *gi)
        {
          SetDrawModeHiRes(new_element);
 
-         if (new_element == EL_PLAYER_1)
+         if (IS_PLAYER_ELEMENT(new_element))
          {
            // remove player at old position
            for (y = 0; y < lev_fieldy; y++)
+           {
              for (x = 0; x < lev_fieldx; x++)
-               if (Feld[x][y] == EL_PLAYER_1)
-                 SetElement(x, y, EL_EMPTY);
+             {
+               int old_element = Tile[x][y];
+
+               if (IS_PLAYER_ELEMENT(old_element))
+               {
+                 int replaced_with_element =
+                   (old_element == EL_SOKOBAN_FIELD_PLAYER &&
+                    new_element == EL_PLAYER_1 ? EL_SOKOBAN_FIELD_EMPTY :
+
+                    old_element == EL_SOKOBAN_FIELD_PLAYER &&
+                    new_element == old_element ? EL_SOKOBAN_FIELD_EMPTY :
+
+                    new_element == EL_SOKOBAN_FIELD_PLAYER &&
+                    old_element == EL_PLAYER_1 ? EL_EMPTY :
+
+                    new_element >= EL_PLAYER_1 &&
+                    new_element <= EL_PLAYER_4 &&
+                    new_element == old_element ? EL_EMPTY :
+
+                    old_element);
+
+                 SetElement(x, y, replaced_with_element);
+               }
+             }
+           }
          }
 
          SetElementButton(lx, ly, dx, dy, new_element, button);
@@ -12876,7 +13237,7 @@ static void HandleDrawingAreas(struct GadgetInfo *gi)
       break;
 
     case GADGET_ID_FLOOD_FILL:
-      if (button_press_event && Feld[lx][ly] != new_element)
+      if (button_press_event && Tile[lx][ly] != new_element)
       {
        if (IS_MM_WALL_EDITOR(new_element))
          FloodFillWall_MM(sx2, sy2, new_element);
@@ -12893,7 +13254,7 @@ static void HandleDrawingAreas(struct GadgetInfo *gi)
        ClickOnGadget(level_editor_gadget[last_drawing_function],
                      MB_LEFTBUTTON);
       else if (draw_level)
-       PickDrawingElement(button, Feld[lx][ly]);
+       PickDrawingElement(button, Tile[lx][ly]);
       else
       {
        int pos = sx * drawingarea_info[type_id].area_ysize + sy;
@@ -13137,10 +13498,10 @@ static void HandleTextbuttonGadgets(struct GadgetInfo *gi)
     boolean new_template = !fileExists(getLocalLevelTemplateFilename());
 
     // backup original "level.field" (needed to track playfield changes)
-    CopyPlayfield(level.field, FieldBackup);
+    CopyPlayfield(level.field, TileBackup);
 
     // "SaveLevelTemplate()" uses "level.field", so copy editor playfield
-    CopyPlayfield(Feld, level.field);
+    CopyPlayfield(Tile, level.field);
 
     if (new_template ||
        Request("Save this template and kill the old?", REQ_ASK))
@@ -13150,7 +13511,7 @@ static void HandleTextbuttonGadgets(struct GadgetInfo *gi)
       Request("Template saved!", REQ_CONFIRM);
 
     // restore original "level.field" (needed to track playfield changes)
-    CopyPlayfield(FieldBackup, level.field);
+    CopyPlayfield(TileBackup, level.field);
   }
   else if (type_id == ED_TEXTBUTTON_ID_SAVE_LEVELSET)
   {
@@ -13159,7 +13520,7 @@ static void HandleTextbuttonGadgets(struct GadgetInfo *gi)
     if (levelset_save_mode == LEVELSET_SAVE_MODE_UPDATE &&
        leveldir_current->readonly)
     {
-      Request("This level set is read only!", REQ_CONFIRM);
+      Request("This level set is read-only!", REQ_CONFIRM);
 
       return;
     }
@@ -13350,9 +13711,11 @@ static void HandleCheckbuttons(struct GadgetInfo *gi)
     boolean template_related_changes_found = FALSE;
     int i;
 
-    // check if any custom or group elements have been changed
+    // check if any custom, group or empty elements have been changed
     for (i = 0; i < NUM_FILE_ELEMENTS; i++)
-      if ((IS_CUSTOM_ELEMENT(i) || IS_GROUP_ELEMENT(i)) &&
+      if ((IS_CUSTOM_ELEMENT(i) ||
+          IS_GROUP_ELEMENT(i) ||
+          IS_EMPTY_ELEMENT(i)) &&
          element_info[i].modified_settings)
        template_related_changes_found = TRUE;
 
@@ -13620,7 +13983,7 @@ static void HandleControlButtons(struct GadgetInfo *gi)
       }
       else
       {
-       ChangeEditModeWindow(last_edit_mode);
+       ChangeEditModeWindow(ED_MODE_DRAWING);
 
        ClickOnGadget(level_editor_gadget[last_level_drawing_function],
                      MB_LEFTBUTTON);
@@ -13682,6 +14045,10 @@ static void HandleControlButtons(struct GadgetInfo *gi)
                     button == 2 ? ed_tilesize_default :
                     button == 3 ? ed_tilesize / 2 : ed_tilesize);
 
+      // when using touch device, cycle through all zoom tilesizes
+      if (runtime.uses_touch_device && ed_tilesize > TILESIZE)
+       ed_tilesize = MICRO_TILESIZE;
+
       // limit zoom level by upper and lower bound
       ed_tilesize = MIN(MAX(MICRO_TILESIZE, ed_tilesize), TILESIZE);
 
@@ -13716,7 +14083,9 @@ static void HandleControlButtons(struct GadgetInfo *gi)
       break;
 
     case GADGET_ID_UNDO:
-      if (button == 1 && GetKeyModState() & (KMOD_Shift|KMOD_Control))
+      if (button < 0)  // keep button value (even if modifier keys are pressed)
+       button = -button;
+      else if (button == 1 && GetKeyModState() & (KMOD_Shift | KMOD_Control))
        button = 3;
 
       if (button == 1 && undo_buffer_steps == 0)
@@ -13761,7 +14130,7 @@ static void HandleControlButtons(struct GadgetInfo *gi)
 
       for (x = 0; x < lev_fieldx; x++)
        for (y = 0; y < lev_fieldy; y++)
-         Feld[x][y] = UndoBuffer[undo_buffer_position][x][y];
+         Tile[x][y] = UndoBuffer[undo_buffer_position][x][y];
 
       // check if undo operation forces change of border style
       CheckLevelBorderElement(FALSE);
@@ -13779,7 +14148,7 @@ static void HandleControlButtons(struct GadgetInfo *gi)
       }
       else
       {
-       ChangeEditModeWindow(last_edit_mode);
+       ChangeEditModeWindow(ED_MODE_DRAWING);
       }
       break;
 
@@ -13789,7 +14158,7 @@ static void HandleControlButtons(struct GadgetInfo *gi)
 
       for (x = 0; x < MAX_LEV_FIELDX; x++)
        for (y = 0; y < MAX_LEV_FIELDY; y++)
-         Feld[x][y] = (button == 1 ? EL_EMPTY : new_element);
+         Tile[x][y] = (button == 1 ? EL_EMPTY : new_element);
 
       CopyLevelToUndoBuffer(GADGET_ID_CLEAR);
 
@@ -13820,7 +14189,7 @@ static void HandleControlButtons(struct GadgetInfo *gi)
 
        SetAutomaticNumberOfGemsNeeded();
 
-       CopyPlayfield(Feld, level.field);
+       CopyPlayfield(Tile, level.field);
        SaveLevel(level_nr);
 
        level.changed = FALSE;
@@ -13851,8 +14220,8 @@ static void HandleControlButtons(struct GadgetInfo *gi)
       if (LevelChanged())
        level.game_version = GAME_VERSION_ACTUAL;
 
-      CopyPlayfield(level.field, FieldBackup);
-      CopyPlayfield(Feld, level.field);
+      CopyPlayfield(level.field, TileBackup);
+      CopyPlayfield(Tile, level.field);
 
       CopyNativeLevel_RND_to_Native(&level);
 
@@ -13952,13 +14321,13 @@ static void HandleControlButtons(struct GadgetInfo *gi)
       }
 #ifdef DEBUG
       else if (gi->event.type == GD_EVENT_PRESSED)
-       printf("default: HandleControlButtons: GD_EVENT_PRESSED(%d)\n", id);
+       Debug("editor", "default: HandleControlButtons: GD_EVENT_PRESSED(%d)", id);
       else if (gi->event.type == GD_EVENT_RELEASED)
-       printf("default: HandleControlButtons: GD_EVENT_RELEASED(%d)\n", id);
+       Debug("editor", "default: HandleControlButtons: GD_EVENT_RELEASED(%d)", id);
       else if (gi->event.type == GD_EVENT_MOVING)
-       printf("default: HandleControlButtons: GD_EVENT_MOVING(%d)\n", id);
+       Debug("editor", "default: HandleControlButtons: GD_EVENT_MOVING(%d)", id);
       else
-       printf("default: HandleControlButtons: ? (id == %d)\n", id);
+       Debug("editor", "default: HandleControlButtons: ? (id == %d)", id);
 #endif
       break;
   }
@@ -13967,7 +14336,6 @@ static void HandleControlButtons(struct GadgetInfo *gi)
 void HandleLevelEditorKeyInput(Key key)
 {
   char letter = getCharFromKey(key);
-  int button = MB_LEFTBUTTON;
 
   if (drawing_function == GADGET_ID_TEXT &&
       DrawLevelText(0, 0, 0, TEXT_QUERY_TYPING) == TRUE)
@@ -13980,165 +14348,154 @@ void HandleLevelEditorKeyInput(Key key)
       DrawLevelText(0, 0, 0, TEXT_NEWLINE);
     else if (key == KSYM_Escape)
       DrawLevelText(0, 0, 0, TEXT_END);
+
+    return;
   }
-  else if (button_status == MB_RELEASED)
-  {
-    int id = GADGET_ID_NONE;
-    int new_element_shift = element_shift;
-    int step = ED_ELEMENTLIST_BUTTONS_VERT - 1;
-    int i;
 
-    switch (key)
-    {
-      case KSYM_Left:
-       id = GADGET_ID_SCROLL_LEFT;
-       break;
-      case KSYM_Right:
-       id = GADGET_ID_SCROLL_RIGHT;
-       break;
-      case KSYM_Up:
-       id = GADGET_ID_SCROLL_UP;
-       break;
-      case KSYM_Down:
-       id = GADGET_ID_SCROLL_DOWN;
-       break;
+  int id = GADGET_ID_NONE;
+  int new_element_shift = element_shift;
+  int step = ED_ELEMENTLIST_BUTTONS_VERT - 1;
+  int button = MB_LEFTBUTTON;
+  int i;
 
-      case KSYM_Page_Up:
-      case KSYM_Page_Down:
-       step *= (key == KSYM_Page_Up ? -1 : +1);
-        element_shift += step * ED_ELEMENTLIST_BUTTONS_HORIZ;
+  switch (key)
+  {
+    case KSYM_Left:
+      id = GADGET_ID_SCROLL_LEFT;
+      break;
+    case KSYM_Right:
+      id = GADGET_ID_SCROLL_RIGHT;
+      break;
+    case KSYM_Up:
+      id = GADGET_ID_SCROLL_UP;
+      break;
+    case KSYM_Down:
+      id = GADGET_ID_SCROLL_DOWN;
+      break;
 
-        if (element_shift < 0)
-          element_shift = 0;
-        if (element_shift > num_editor_elements - ED_NUM_ELEMENTLIST_BUTTONS)
-          element_shift = num_editor_elements - ED_NUM_ELEMENTLIST_BUTTONS;
+    case KSYM_Page_Up:
+    case KSYM_Page_Down:
+      step *= (key == KSYM_Page_Up ? -1 : +1);
+      element_shift += step * ED_ELEMENTLIST_BUTTONS_HORIZ;
 
-        ModifyGadget(level_editor_gadget[GADGET_ID_SCROLL_LIST_VERTICAL],
-                     GDI_SCROLLBAR_ITEM_POSITION,
-                     element_shift / ED_ELEMENTLIST_BUTTONS_HORIZ, GDI_END);
+      if (element_shift < 0)
+       element_shift = 0;
+      if (element_shift > num_editor_elements - ED_NUM_ELEMENTLIST_BUTTONS)
+       element_shift = num_editor_elements - ED_NUM_ELEMENTLIST_BUTTONS;
 
-       ModifyEditorElementList();
+      ModifyGadget(level_editor_gadget[GADGET_ID_SCROLL_LIST_VERTICAL],
+                  GDI_SCROLLBAR_ITEM_POSITION,
+                  element_shift / ED_ELEMENTLIST_BUTTONS_HORIZ, GDI_END);
 
-       break;
+      ModifyEditorElementList();
 
-      case KSYM_Home:
-      case KSYM_End:
-       element_shift = (key == KSYM_Home ? 0 :
-                        num_editor_elements - ED_NUM_ELEMENTLIST_BUTTONS);
+      break;
 
-       ModifyGadget(level_editor_gadget[GADGET_ID_SCROLL_LIST_VERTICAL],
-                    GDI_SCROLLBAR_ITEM_POSITION,
-                    element_shift / ED_ELEMENTLIST_BUTTONS_HORIZ, GDI_END);
+    case KSYM_Home:
+    case KSYM_End:
+      element_shift = (key == KSYM_Home ? 0 :
+                      num_editor_elements - ED_NUM_ELEMENTLIST_BUTTONS);
 
-       ModifyEditorElementList();
+      ModifyGadget(level_editor_gadget[GADGET_ID_SCROLL_LIST_VERTICAL],
+                  GDI_SCROLLBAR_ITEM_POSITION,
+                  element_shift / ED_ELEMENTLIST_BUTTONS_HORIZ, GDI_END);
 
-       break;
+      ModifyEditorElementList();
 
-      case KSYM_Insert:
-      case KSYM_Delete:
+      break;
 
-       // this is needed to prevent interference with running "True X-Mouse"
-       if (GetKeyModStateFromEvents() & KMOD_Control)
-         break;
+    case KSYM_Insert:
+    case KSYM_Delete:
 
-       // check for last or next editor cascade block in element list
-       for (i = 0; i < num_editor_elements; i++)
-       {
-         if ((key == KSYM_Insert && i == element_shift) ||
-             (key == KSYM_Delete && new_element_shift > element_shift))
-           break;
+      // this is needed to prevent interference with running "True X-Mouse"
+      if (GetKeyModStateFromEvents() & KMOD_Control)
+       break;
 
-         // jump to next cascade block (or to start of element list)
-         if (i == 0 || IS_EDITOR_CASCADE(editor_elements[i]))
-           new_element_shift = i;
-       }
+      // check for last or next editor cascade block in element list
+      for (i = 0; i < num_editor_elements; i++)
+      {
+       if ((key == KSYM_Insert && i == element_shift) ||
+           (key == KSYM_Delete && new_element_shift > element_shift))
+         break;
 
-       if (i < num_editor_elements)
-         element_shift = new_element_shift;
+       // jump to next cascade block (or to start of element list)
+       if (i == 0 || IS_EDITOR_CASCADE(editor_elements[i]))
+         new_element_shift = i;
+      }
 
-       if (element_shift > num_editor_elements - ED_NUM_ELEMENTLIST_BUTTONS)
-         element_shift = num_editor_elements - ED_NUM_ELEMENTLIST_BUTTONS;
+      if (i < num_editor_elements)
+       element_shift = new_element_shift;
 
-       ModifyGadget(level_editor_gadget[GADGET_ID_SCROLL_LIST_VERTICAL],
-                    GDI_SCROLLBAR_ITEM_POSITION,
-                    element_shift / ED_ELEMENTLIST_BUTTONS_HORIZ, GDI_END);
+      if (element_shift > num_editor_elements - ED_NUM_ELEMENTLIST_BUTTONS)
+       element_shift = num_editor_elements - ED_NUM_ELEMENTLIST_BUTTONS;
 
-       ModifyEditorElementList();
+      ModifyGadget(level_editor_gadget[GADGET_ID_SCROLL_LIST_VERTICAL],
+                  GDI_SCROLLBAR_ITEM_POSITION,
+                  element_shift / ED_ELEMENTLIST_BUTTONS_HORIZ, GDI_END);
 
-       break;
+      ModifyEditorElementList();
 
-      case KSYM_Escape:
-        if (edit_mode == ED_MODE_DRAWING)
-       {
-         RequestExitLevelEditor(setup.ask_on_escape_editor, TRUE);
-       }
-        else if (edit_mode == ED_MODE_INFO)
-       {
-         HandleControlButtons(level_editor_gadget[GADGET_ID_INFO]);
-       }
-        else if (edit_mode == ED_MODE_PROPERTIES)
-       {
-         HandleControlButtons(level_editor_gadget[GADGET_ID_PROPERTIES]);
-       }
-        else if (edit_mode == ED_MODE_PALETTE)
-       {
-         HandleControlButtons(level_editor_gadget[GADGET_ID_PALETTE]);
-       }
-       else            // should never happen
-       {
-         ChangeEditModeWindow(ED_MODE_DRAWING);
-       }
+      break;
 
-        break;
+    case KSYM_Escape:
+      if (edit_mode == ED_MODE_DRAWING)
+       RequestExitLevelEditor(setup.ask_on_escape_editor, TRUE);
+      else if (edit_mode == ED_MODE_INFO)
+       HandleControlButtons(level_editor_gadget[GADGET_ID_INFO]);
+      else if (edit_mode == ED_MODE_PROPERTIES)
+       HandleControlButtons(level_editor_gadget[GADGET_ID_PROPERTIES]);
+      else if (edit_mode == ED_MODE_PALETTE)
+       HandleControlButtons(level_editor_gadget[GADGET_ID_PALETTE]);
+      else             // should never happen
+       ChangeEditModeWindow(ED_MODE_DRAWING);
 
-      default:
-       break;
-    }
+      break;
 
-    if (id != GADGET_ID_NONE)
-      ClickOnGadget(level_editor_gadget[id], button);
-    else if (letter == '1' || letter == '?')
-      ClickOnGadget(level_editor_gadget[GADGET_ID_ELEMENT_LEFT], button);
-    else if (letter == '2')
-      ClickOnGadget(level_editor_gadget[GADGET_ID_ELEMENT_MIDDLE], button);
-    else if (letter == '3')
-      ClickOnGadget(level_editor_gadget[GADGET_ID_ELEMENT_RIGHT], button);
-    else if (letter == '.')
-      ClickOnGadget(level_editor_gadget[GADGET_ID_SINGLE_ITEMS], button);
-    else if (letter == 'U')
-      ClickOnGadget(level_editor_gadget[GADGET_ID_UNDO], 3);
-    else if (letter == '-' || key == KSYM_KP_Subtract)
-      ClickOnGadget(level_editor_gadget[GADGET_ID_ZOOM], 3);
-    else if (letter == '0' || key == KSYM_KP_0)
-      ClickOnGadget(level_editor_gadget[GADGET_ID_ZOOM], 2);
-    else if (letter == '+' || key == KSYM_KP_Add ||
-            letter == '=')     // ("Shift-=" is "+" on US keyboards)
-      ClickOnGadget(level_editor_gadget[GADGET_ID_ZOOM], 1);
-    else if (key == KSYM_Return ||
-            key == KSYM_space ||
-            key == setup.shortcut.toggle_pause)
-      ClickOnGadget(level_editor_gadget[GADGET_ID_TEST], button);
-    else
-      for (i = 0; i < ED_NUM_CTRL_BUTTONS; i++)
-       if (letter && letter == controlbutton_info[i].shortcut)
-         if (!anyTextGadgetActive())
-           ClickOnGadget(level_editor_gadget[i], button);
+    default:
+      break;
   }
+
+  if (id != GADGET_ID_NONE)
+    ClickOnGadget(level_editor_gadget[id], button);
+  else if (letter == '1' || letter == '?')
+    ClickOnGadget(level_editor_gadget[GADGET_ID_ELEMENT_LEFT], button);
+  else if (letter == '2')
+    ClickOnGadget(level_editor_gadget[GADGET_ID_ELEMENT_MIDDLE], button);
+  else if (letter == '3')
+    ClickOnGadget(level_editor_gadget[GADGET_ID_ELEMENT_RIGHT], button);
+  else if (letter == '.')
+    ClickOnGadget(level_editor_gadget[GADGET_ID_SINGLE_ITEMS], button);
+  else if (letter == 'U')
+    ClickOnGadget(level_editor_gadget[GADGET_ID_UNDO], 3);
+  else if (letter == '-' || key == KSYM_KP_Subtract)
+    ClickOnGadget(level_editor_gadget[GADGET_ID_ZOOM], 3);
+  else if (letter == '0' || key == KSYM_KP_0)
+    ClickOnGadget(level_editor_gadget[GADGET_ID_ZOOM], 2);
+  else if (letter == '+' || key == KSYM_KP_Add ||
+          letter == '=')       // ("Shift-=" is "+" on US keyboards)
+    ClickOnGadget(level_editor_gadget[GADGET_ID_ZOOM], 1);
+  else if (key == KSYM_Return ||
+          key == KSYM_space ||
+          key == setup.shortcut.toggle_pause)
+    ClickOnGadget(level_editor_gadget[GADGET_ID_TEST], button);
+  else
+    for (i = 0; i < ED_NUM_CTRL_BUTTONS; i++)
+      if (letter && letter == controlbutton_info[i].shortcut)
+       if (!anyTextGadgetActive())
+         ClickOnGadget(level_editor_gadget[i], button);
 }
 
-void HandleLevelEditorIdle(void)
+static void HandleLevelEditorIdle_Properties(void)
 {
   int element_border = graphic_info[IMG_EDITOR_ELEMENT_BORDER].border_size;
   int x = editor.settings.element_graphic.x + element_border;
   int y = editor.settings.element_graphic.y + element_border;
-  static unsigned int action_delay = 0;
-  unsigned int action_delay_value = GameFrameDelay;
+  static DelayCounter action_delay = { 0 };
   int i;
 
-  if (edit_mode != ED_MODE_PROPERTIES)
-    return;
+  action_delay.value = GameFrameDelay;
 
-  if (!DelayReached(&action_delay, action_delay_value))
+  if (!DelayReached(&action_delay))
     return;
 
   for (i = 0; i < ED_NUM_SELECTBOX; i++)
@@ -14156,6 +14513,29 @@ void HandleLevelEditorIdle(void)
   FrameCounter++;      // increase animation frame counter
 }
 
+static void HandleLevelEditorIdle_Drawing(void)
+{
+  static boolean last_highlighted = FALSE;
+  boolean highlighted = (GetKeyModState() & KMOD_Alt);
+
+  if (highlighted != last_highlighted)
+  {
+    DrawAreaElementHighlight(highlighted);
+
+    last_highlighted = highlighted;
+
+    redraw_mask |= REDRAW_FIELD;
+  }
+}
+
+void HandleLevelEditorIdle(void)
+{
+  if (edit_mode == ED_MODE_PROPERTIES)
+    HandleLevelEditorIdle_Properties();
+  else if (edit_mode == ED_MODE_DRAWING)
+    HandleLevelEditorIdle_Drawing();
+}
+
 static void ClearEditorGadgetInfoText(void)
 {
   DrawBackground(INFOTEXT_XPOS, INFOTEXT_YPOS, INFOTEXT_XSIZE, INFOTEXT_YSIZE);
@@ -14327,7 +14707,7 @@ static void HandleDrawingAreaInfo(struct GadgetInfo *gi)
                  ABS(lx - start_lx) + 1, ABS(ly - start_ly) + 1);
       }
       else if (actual_drawing_function == GADGET_ID_PICK_ELEMENT)
-       strncpy(infotext, getElementInfoText(Feld[lx][ly]), max_infotext_len);
+       strncpy(infotext, getElementInfoText(Tile[lx][ly]), max_infotext_len);
       else
        sprintf(infotext, "Level position: %d, %d", lx, ly);
     }