added new animation mode ".global_anim_sync" for game element graphics
[rocksndiamonds.git] / src / game.c
index 2002126623cb737ffc4f103eb36e8d72435e043b..178f35defaf7352aff75dd66bbd529c6e22ad41c 100644 (file)
@@ -1058,7 +1058,10 @@ static void CheckGravityMovementWhenNotMoving(struct PlayerInfo *);
 static void KillPlayerUnlessEnemyProtected(int, int);
 static void KillPlayerUnlessExplosionProtected(int, int);
 
+static void CheckNextToConditions(int, int);
+static void TestIfPlayerNextToCustomElement(int, int);
 static void TestIfPlayerTouchesCustomElement(int, int);
+static void TestIfElementNextToCustomElement(int, int);
 static void TestIfElementTouchesCustomElement(int, int);
 static void TestIfElementHitsCustomElement(int, int, int);
 
@@ -1106,7 +1109,7 @@ void ContinueMoving(int, int);
 void Bang(int, int);
 void InitMovDir(int, int);
 void InitAmoebaNr(int, int);
-int NewHiScore(int);
+void NewHighScore(int, boolean);
 
 void TestIfGoodThingHitsBadThing(int, int, int);
 void TestIfBadThingHitsGoodThing(int, int, int);
@@ -1551,6 +1554,14 @@ access_direction_list[] =
   { EL_UNDEFINED,                      MV_NONE                              }
 };
 
+static struct XY xy_topdown[] =
+{
+  {  0, -1 },
+  { -1,  0 },
+  { +1,  0 },
+  {  0, +1 }
+};
+
 static boolean trigger_events[MAX_NUM_ELEMENTS][NUM_CHANGE_EVENTS];
 
 #define IS_AUTO_CHANGING(e)    (element_info[e].has_change_event[CE_DELAY])
@@ -1773,7 +1784,7 @@ static void InitPlayerField(int x, int y, int element, boolean init_game)
       player->active = TRUE;
 
       // remove potentially duplicate players
-      if (StorePlayer[jx][jy] == Tile[x][y])
+      if (IN_LEV_FIELD(jx, jy) && StorePlayer[jx][jy] == Tile[x][y])
        StorePlayer[jx][jy] = 0;
 
       StorePlayer[x][y] = Tile[x][y];
@@ -1834,15 +1845,15 @@ static void InitField(int x, int y, boolean init_game)
       break;
 
     case EL_STONEBLOCK:
-      if (x < lev_fieldx-1 && Tile[x+1][y] == EL_ACID)
+      if (x < lev_fieldx - 1 && Tile[x + 1][y] == EL_ACID)
        Tile[x][y] = EL_ACID_POOL_TOPLEFT;
-      else if (x > 0 && Tile[x-1][y] == EL_ACID)
+      else if (x > 0 && Tile[x - 1][y] == EL_ACID)
        Tile[x][y] = EL_ACID_POOL_TOPRIGHT;
-      else if (y > 0 && Tile[x][y-1] == EL_ACID_POOL_TOPLEFT)
+      else if (y > 0 && Tile[x][y - 1] == EL_ACID_POOL_TOPLEFT)
        Tile[x][y] = EL_ACID_POOL_BOTTOMLEFT;
-      else if (y > 0 && Tile[x][y-1] == EL_ACID)
+      else if (y > 0 && Tile[x][y - 1] == EL_ACID)
        Tile[x][y] = EL_ACID_POOL_BOTTOM;
-      else if (y > 0 && Tile[x][y-1] == EL_ACID_POOL_TOPRIGHT)
+      else if (y > 0 && Tile[x][y - 1] == EL_ACID_POOL_TOPRIGHT)
        Tile[x][y] = EL_ACID_POOL_BOTTOMRIGHT;
       break;
 
@@ -2025,6 +2036,14 @@ static void InitField(int x, int y, boolean init_game)
 
        InitField(x, y, init_game);
       }
+      else if (IS_EMPTY_ELEMENT(element))
+      {
+       GfxElementEmpty[x][y] = element;
+       Tile[x][y] = EL_EMPTY;
+
+       if (element_info[element].use_gfx_element)
+         game.use_masked_elements = TRUE;
+      }
 
       break;
   }
@@ -2228,7 +2247,7 @@ static void UpdateGameControlValues(void)
              game_sp.time_played :
              level.game_engine_type == GAME_ENGINE_TYPE_MM ?
              game_mm.energy_left :
-             game.no_time_limit ? TimePlayed : TimeLeft);
+             game.no_level_time_limit ? TimePlayed : TimeLeft);
   int score = (game.LevelSolved ?
               game.LevelSolved_CountingScore :
               level.game_engine_type == GAME_ENGINE_TYPE_EM ?
@@ -2547,7 +2566,9 @@ static void UpdateGameControlValues(void)
        int element = gpc->value;
        int graphic = el2panelimg(element);
        int init_gfx_random = (graphic_info[graphic].anim_global_sync ?
-                              sync_random_frame : INIT_GFX_RANDOM());
+                              sync_random_frame :
+                              graphic_info[graphic].anim_global_anim_sync ?
+                              getGlobalAnimSyncFrame() : INIT_GFX_RANDOM());
 
        if (gpc->value != gpc->last_value)
        {
@@ -2582,7 +2603,9 @@ static void UpdateGameControlValues(void)
        int last_anim_random_frame = gfx.anim_random_frame;
        int graphic = gpc->graphic;
        int init_gfx_random = (graphic_info[graphic].anim_global_sync ?
-                              sync_random_frame : INIT_GFX_RANDOM());
+                              sync_random_frame :
+                              graphic_info[graphic].anim_global_anim_sync ?
+                              getGlobalAnimSyncFrame() : INIT_GFX_RANDOM());
 
        if (gpc->value != gpc->last_value)
        {
@@ -2670,15 +2693,25 @@ static void DisplayGameControlValues(void)
     if (type == TYPE_INTEGER)
     {
       if (nr == GAME_PANEL_LEVEL_NUMBER ||
+         nr == GAME_PANEL_INVENTORY_COUNT ||
+         nr == GAME_PANEL_SCORE ||
+         nr == GAME_PANEL_HIGHSCORE ||
          nr == GAME_PANEL_TIME)
       {
        boolean use_dynamic_size = (size == -1 ? TRUE : FALSE);
 
        if (use_dynamic_size)           // use dynamic number of digits
        {
-         int value_change = (nr == GAME_PANEL_LEVEL_NUMBER ? 100 : 1000);
-         int size1 = (nr == GAME_PANEL_LEVEL_NUMBER ? 2 : 3);
-         int size2 = size1 + 1;
+         int value_change = (nr == GAME_PANEL_LEVEL_NUMBER ? 100 :
+                             nr == GAME_PANEL_INVENTORY_COUNT ||
+                             nr == GAME_PANEL_TIME ? 1000 : 100000);
+         int size_add = (nr == GAME_PANEL_LEVEL_NUMBER ||
+                         nr == GAME_PANEL_INVENTORY_COUNT ||
+                         nr == GAME_PANEL_TIME ? 1 : 2);
+         int size1 = (nr == GAME_PANEL_LEVEL_NUMBER ? 2 :
+                      nr == GAME_PANEL_INVENTORY_COUNT ||
+                      nr == GAME_PANEL_TIME ? 3 : 5);
+         int size2 = size1 + size_add;
          int font1 = pos->font;
          int font2 = pos->font_alt;
 
@@ -3542,7 +3575,6 @@ void InitGame(void)
   int fade_mask = REDRAW_FIELD;
 
   boolean emulate_bd = TRUE;   // unless non-BOULDERDASH elements found
-  boolean emulate_sb = TRUE;   // unless non-SOKOBAN     elements found
   boolean emulate_sp = TRUE;   // unless non-SUPAPLEX    elements found
   int initial_move_dir = MV_DOWN;
   int i, j, x, y;
@@ -3660,7 +3692,8 @@ void InitGame(void)
 
     player->can_fall_into_acid = CAN_MOVE_INTO_ACID(player->element_nr);
 
-    player->actual_frame_counter = 0;
+    player->actual_frame_counter.count = 0;
+    player->actual_frame_counter.value = 1;
 
     player->step_counter = 0;
 
@@ -3798,7 +3831,8 @@ void InitGame(void)
 
   game.panel.active = TRUE;
 
-  game.no_time_limit = (level.time == 0);
+  game.no_level_time_limit = (level.time == 0);
+  game.time_limit = (leveldir_current->time_limit && setup.time_limit);
 
   game.yamyam_content_nr = 0;
   game.robot_wheel_active = FALSE;
@@ -3835,6 +3869,9 @@ void InitGame(void)
 
   game.envelope_active = FALSE;
 
+  // special case: set custom artwork setting to initial value
+  game.use_masked_elements = game.use_masked_elements_initial;
+
   for (i = 0; i < NUM_BELTS; i++)
   {
     game.belt_dir[i] = MV_NONE;
@@ -3876,7 +3913,9 @@ void InitGame(void)
 
     GfxFrame[x][y] = 0;
     GfxRandom[x][y] = INIT_GFX_RANDOM();
+    GfxRandomStatic[x][y] = INIT_GFX_RANDOM();
     GfxElement[x][y] = EL_UNDEFINED;
+    GfxElementEmpty[x][y] = EL_EMPTY;
     GfxAction[x][y] = ACTION_DEFAULT;
     GfxDir[x][y] = MV_NONE;
     GfxRedraw[x][y] = GFX_REDRAW_NONE;
@@ -3886,8 +3925,6 @@ void InitGame(void)
   {
     if (emulate_bd && !IS_BD_ELEMENT(Tile[x][y]))
       emulate_bd = FALSE;
-    if (emulate_sb && !IS_SB_ELEMENT(Tile[x][y]))
-      emulate_sb = FALSE;
     if (emulate_sp && !IS_SP_ELEMENT(Tile[x][y]))
       emulate_sp = FALSE;
 
@@ -3912,7 +3949,6 @@ void InitGame(void)
   }
 
   game.emulation = (emulate_bd ? EMU_BOULDERDASH :
-                   emulate_sb ? EMU_SOKOBAN :
                    emulate_sp ? EMU_SUPAPLEX : EMU_NONE);
 
   // initialize type of slippery elements
@@ -4310,7 +4346,7 @@ void InitGame(void)
        {
          // check for player created from custom element as single target
          content = element_info[element].change_page[i].target_element;
-         is_player = ELEM_IS_PLAYER(content);
+         is_player = IS_PLAYER_ELEMENT(content);
 
          if (is_player && (found_rating < 3 ||
                            (found_rating == 3 && element < found_element)))
@@ -4328,7 +4364,7 @@ void InitGame(void)
       {
        // check for player created from custom element as explosion content
        content = element_info[element].content.e[xx][yy];
-       is_player = ELEM_IS_PLAYER(content);
+       is_player = IS_PLAYER_ELEMENT(content);
 
        if (is_player && (found_rating < 2 ||
                          (found_rating == 2 && element < found_element)))
@@ -4349,7 +4385,7 @@ void InitGame(void)
          content =
            element_info[element].change_page[i].target_content.e[xx][yy];
 
-         is_player = ELEM_IS_PLAYER(content);
+         is_player = IS_PLAYER_ELEMENT(content);
 
          if (is_player && (found_rating < 1 ||
                            (found_rating == 1 && element < found_element)))
@@ -4480,6 +4516,8 @@ void InitGame(void)
     if (setup.sound_music)
       PlayLevelMusic();
   }
+
+  SetPlayfieldMouseCursorEnabled(!game.use_mouse_actions);
 }
 
 void UpdateEngineValues(int actual_scroll_x, int actual_scroll_y,
@@ -4700,6 +4738,40 @@ void InitAmoebaNr(int x, int y)
   AmoebaCnt2[group_nr]++;
 }
 
+static void LevelSolved_SetFinalGameValues(void)
+{
+  game.time_final = (game.no_level_time_limit ? TimePlayed : TimeLeft);
+  game.score_time_final = (level.use_step_counter ? TimePlayed :
+                          TimePlayed * FRAMES_PER_SECOND + TimeFrames);
+
+  game.score_final = (level.game_engine_type == GAME_ENGINE_TYPE_EM ?
+                     game_em.lev->score :
+                     level.game_engine_type == GAME_ENGINE_TYPE_MM ?
+                     game_mm.score :
+                     game.score);
+
+  game.health_final = (level.game_engine_type == GAME_ENGINE_TYPE_MM ?
+                      MM_HEALTH(game_mm.laser_overload_value) :
+                      game.health);
+
+  game.LevelSolved_CountingTime = game.time_final;
+  game.LevelSolved_CountingScore = game.score_final;
+  game.LevelSolved_CountingHealth = game.health_final;
+}
+
+static void LevelSolved_DisplayFinalGameValues(int time, int score, int health)
+{
+  game.LevelSolved_CountingTime = time;
+  game.LevelSolved_CountingScore = score;
+  game.LevelSolved_CountingHealth = health;
+
+  game_panel_controls[GAME_PANEL_TIME].value = time;
+  game_panel_controls[GAME_PANEL_SCORE].value = score;
+  game_panel_controls[GAME_PANEL_HEALTH].value = health;
+
+  DisplayGameControlValues();
+}
+
 static void LevelSolved(void)
 {
   if (level.game_engine_type == GAME_ENGINE_TYPE_RND &&
@@ -4708,6 +4780,11 @@ static void LevelSolved(void)
 
   game.LevelSolved = TRUE;
   game.GameOver = TRUE;
+
+  tape.solved = TRUE;
+
+  // needed here to display correct panel values while player walks into exit
+  LevelSolved_SetFinalGameValues();
 }
 
 void GameWon(void)
@@ -4730,23 +4807,8 @@ void GameWon(void)
     if (local_player->active && local_player->MovPos)
       return;
 
-    game.time_final = (game.no_time_limit ? TimePlayed : TimeLeft);
-    game.score_time_final = (level.use_step_counter ? TimePlayed :
-                            TimePlayed * FRAMES_PER_SECOND + TimeFrames);
-
-    game.score_final = (level.game_engine_type == GAME_ENGINE_TYPE_EM ?
-                       game_em.lev->score :
-                       level.game_engine_type == GAME_ENGINE_TYPE_MM ?
-                       game_mm.score :
-                       game.score);
-
-    game.health_final = (level.game_engine_type == GAME_ENGINE_TYPE_MM ?
-                        MM_HEALTH(game_mm.laser_overload_value) :
-                        game.health);
-
-    game.LevelSolved_CountingTime = game.time_final;
-    game.LevelSolved_CountingScore = game.score_final;
-    game.LevelSolved_CountingHealth = game.health_final;
+    // calculate final game values after player finished walking into exit
+    LevelSolved_SetFinalGameValues();
 
     game.LevelSolved_GameWon = TRUE;
     game.LevelSolved_SaveTape = tape.recording;
@@ -4772,6 +4834,10 @@ void GameWon(void)
     score = score_final = game.score_final;
     health = health_final = game.health_final;
 
+    // update game panel values before (delayed) counting of score (if any)
+    LevelSolved_DisplayFinalGameValues(time, score, health);
+
+    // if level has time score defined, calculate new final game values
     if (time_score > 0)
     {
       int time_final_max = 999;
@@ -4785,7 +4851,7 @@ void GameWon(void)
        time_final = 0;
        time_frames = time_frames_left;
       }
-      else if (game.no_time_limit && TimePlayed < time_final_max)
+      else if (game.no_level_time_limit && TimePlayed < time_final_max)
       {
        time_final = time_final_max;
        time_frames = time_frames_final_max - time_frames_played;
@@ -4805,18 +4871,13 @@ void GameWon(void)
       game.health_final = health_final;
     }
 
+    // if not counting score after game, immediately update game panel values
     if (level_editor_test_game || !setup.count_score_after_game)
     {
       time = time_final;
       score = score_final;
 
-      game.LevelSolved_CountingTime = time;
-      game.LevelSolved_CountingScore = score;
-
-      game_panel_controls[GAME_PANEL_TIME].value = time;
-      game_panel_controls[GAME_PANEL_SCORE].value = score;
-
-      DisplayGameControlValues();
+      LevelSolved_DisplayFinalGameValues(time, score, health);
     }
 
     if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
@@ -4893,13 +4954,7 @@ void GameWon(void)
       if (time == time_final)
        score = score_final;
 
-      game.LevelSolved_CountingTime = time;
-      game.LevelSolved_CountingScore = score;
-
-      game_panel_controls[GAME_PANEL_TIME].value = time;
-      game_panel_controls[GAME_PANEL_SCORE].value = score;
-
-      DisplayGameControlValues();
+      LevelSolved_DisplayFinalGameValues(time, score, health);
 
       if (time == time_final)
        StopSound(SND_GAME_LEVELTIME_BONUS);
@@ -4925,13 +4980,7 @@ void GameWon(void)
       health += health_count_dir;
       score  += time_score;
 
-      game.LevelSolved_CountingHealth = health;
-      game.LevelSolved_CountingScore = score;
-
-      game_panel_controls[GAME_PANEL_HEALTH].value = health;
-      game_panel_controls[GAME_PANEL_SCORE].value = score;
-
-      DisplayGameControlValues();
+      LevelSolved_DisplayFinalGameValues(time, score, health);
 
       if (health == health_final)
        StopSound(SND_GAME_LEVELTIME_BONUS);
@@ -4960,17 +5009,18 @@ void GameEnd(void)
 {
   // used instead of "level_nr" (needed for network games)
   int last_level_nr = levelset.level_nr;
-  int hi_pos;
+  boolean tape_saved = FALSE;
 
   game.LevelSolved_GameEnd = TRUE;
 
-  if (game.LevelSolved_SaveTape)
+  if (game.LevelSolved_SaveTape && !score_info_tape_play)
   {
     // make sure that request dialog to save tape does not open door again
     if (!global.use_envelope_request)
       CloseDoor(DOOR_CLOSE_1);
 
-    SaveTapeChecked_LevelSolved(tape.level_nr);                // ask to save tape
+    // ask to save tape
+    tape_saved = SaveTapeChecked_LevelSolved(tape.level_nr);
 
     // set unique basename for score tape (also saved in high score table)
     strcpy(tape.score_tape_basename, getScoreTapeBasename(setup.player_name));
@@ -4979,7 +5029,7 @@ void GameEnd(void)
   // if no tape is to be saved, close both doors simultaneously
   CloseDoor(DOOR_CLOSE_ALL);
 
-  if (level_editor_test_game)
+  if (level_editor_test_game || score_info_tape_play)
   {
     SetGameStatus(GAME_MODE_MAIN);
 
@@ -5004,6 +5054,9 @@ void GameEnd(void)
     SaveLevelSetup_SeriesInfo();
   }
 
+  // save score and score tape before potentially erasing tape below
+  NewHighScore(last_level_nr, tape_saved);
+
   if (setup.increment_levels &&
       level_nr < leveldir_current->last_level &&
       !network_playing)
@@ -5013,23 +5066,22 @@ void GameEnd(void)
 
     if (setup.auto_play_next_level)
     {
+      scores.continue_playing = TRUE;
+      scores.next_level_nr = level_nr;
+
       LoadLevel(level_nr);
 
       SaveLevelSetup_SeriesInfo();
     }
   }
 
-  hi_pos = NewHiScore(last_level_nr);
-
-  if (hi_pos >= 0 && setup.show_scores_after_game)
+  if (scores.last_added >= 0 && setup.show_scores_after_game)
   {
     SetGameStatus(GAME_MODE_SCORES);
 
-    DrawHallOfFame(last_level_nr, hi_pos);
+    DrawHallOfFame(last_level_nr);
   }
-  else if (setup.auto_play_next_level && setup.increment_levels &&
-          last_level_nr < leveldir_current->last_level &&
-          !network_playing)
+  else if (scores.continue_playing)
   {
     StartGameActions(network.enabled, setup.autorecord, level.random_seed);
   }
@@ -5041,25 +5093,21 @@ void GameEnd(void)
   }
 }
 
-int NewHiScore(int level_nr)
+static int addScoreEntry(struct ScoreInfo *list, struct ScoreEntry *new_entry,
+                        boolean one_score_entry_per_name)
 {
-  int k, l;
-  int position = -1;
-  boolean one_score_entry_per_name = !program.many_scores_per_name;
-
-  LoadScore(level_nr);
+  int i;
 
-  if (strEqual(setup.player_name, EMPTY_PLAYER_NAME) ||
-      game.score_final < scores.entry[MAX_SCORE_ENTRIES - 1].score)
+  if (strEqual(new_entry->name, EMPTY_PLAYER_NAME))
     return -1;
 
-  for (k = 0; k < MAX_SCORE_ENTRIES; k++)
+  for (i = 0; i < MAX_SCORE_ENTRIES; i++)
   {
-    struct ScoreEntry *entry = &scores.entry[k];
-    boolean score_is_better = (game.score_final      >  entry->score);
-    boolean score_is_equal  = (game.score_final      == entry->score);
-    boolean time_is_better  = (game.score_time_final <  entry->time);
-    boolean time_is_equal   = (game.score_time_final == entry->time);
+    struct ScoreEntry *entry = &list->entry[i];
+    boolean score_is_better = (new_entry->score >  entry->score);
+    boolean score_is_equal  = (new_entry->score == entry->score);
+    boolean time_is_better  = (new_entry->time  <  entry->time);
+    boolean time_is_equal   = (new_entry->time  == entry->time);
     boolean better_by_score = (score_is_better ||
                               (score_is_equal && time_is_better));
     boolean better_by_time  = (time_is_better ||
@@ -5069,55 +5117,147 @@ int NewHiScore(int level_nr)
     boolean entry_is_empty = (entry->score == 0 &&
                              entry->time == 0);
 
+    // prevent adding server score entries if also existing in local score file
+    // (special case: historic score entries have an empty tape basename entry)
+    if (strEqual(new_entry->tape_basename, entry->tape_basename) &&
+       !strEqual(new_entry->tape_basename, UNDEFINED_FILENAME))
+    {
+      // add fields from server score entry not stored in local score entry
+      // (currently, this means setting platform, version and country fields;
+      // in rare cases, this may also correct an invalid score value, as
+      // historic scores might have been truncated to 16-bit values locally)
+      *entry = *new_entry;
+
+      return -1;
+    }
+
     if (is_better || entry_is_empty)
     {
       // player has made it to the hall of fame
 
-      if (k < MAX_SCORE_ENTRIES - 1)
+      if (i < MAX_SCORE_ENTRIES - 1)
       {
        int m = MAX_SCORE_ENTRIES - 1;
+       int l;
 
        if (one_score_entry_per_name)
        {
-         for (l = k; l < MAX_SCORE_ENTRIES; l++)
-           if (strEqual(setup.player_name, scores.entry[l].name))
+         for (l = i; l < MAX_SCORE_ENTRIES; l++)
+           if (strEqual(list->entry[l].name, new_entry->name))
              m = l;
 
-         if (m == k)   // player's new highscore overwrites his old one
+         if (m == i)   // player's new highscore overwrites his old one
            goto put_into_list;
        }
 
-       for (l = m; l > k; l--)
-       {
-         strcpy(scores.entry[l].name, scores.entry[l - 1].name);
-         scores.entry[l].score = scores.entry[l - 1].score;
-         scores.entry[l].time  = scores.entry[l - 1].time;
-       }
+       for (l = m; l > i; l--)
+         list->entry[l] = list->entry[l - 1];
       }
 
       put_into_list:
 
-      strcpy(entry->tape_basename, tape.score_tape_basename);
-      strncpy(entry->name, setup.player_name, MAX_PLAYER_NAME_LEN);
-      entry->name[MAX_PLAYER_NAME_LEN] = '\0';
-      entry->score = game.score_final;
-      entry->time = game.score_time_final;
-      position = k;
+      *entry = *new_entry;
 
-      break;
+      return i;
     }
     else if (one_score_entry_per_name &&
-            !strncmp(setup.player_name, entry->name, MAX_PLAYER_NAME_LEN))
-      break;   // player already there with a higher score
+            strEqual(entry->name, new_entry->name))
+    {
+      // player already in high score list with better score or time
+
+      return -1;
+    }
   }
 
-  if (position >= 0)
+  // special case: new score is beyond the last high score list position
+  return MAX_SCORE_ENTRIES;
+}
+
+void NewHighScore(int level_nr, boolean tape_saved)
+{
+  struct ScoreEntry new_entry = {{ 0 }}; // (prevent warning from GCC bug 53119)
+  boolean one_per_name = FALSE;
+
+  strncpy(new_entry.tape_basename, tape.score_tape_basename, MAX_FILENAME_LEN);
+  strncpy(new_entry.name, setup.player_name, MAX_PLAYER_NAME_LEN);
+
+  new_entry.score = game.score_final;
+  new_entry.time = game.score_time_final;
+
+  LoadScore(level_nr);
+
+  scores.last_added = addScoreEntry(&scores, &new_entry, one_per_name);
+
+  if (scores.last_added >= MAX_SCORE_ENTRIES)
+  {
+    scores.last_added = MAX_SCORE_ENTRIES - 1;
+    scores.force_last_added = TRUE;
+
+    scores.entry[scores.last_added] = new_entry;
+
+    // store last added local score entry (before merging server scores)
+    scores.last_added_local = scores.last_added;
+
+    return;
+  }
+
+  if (scores.last_added < 0)
+    return;
+
+  SaveScore(level_nr);
+
+  // store last added local score entry (before merging server scores)
+  scores.last_added_local = scores.last_added;
+
+  if (!game.LevelSolved_SaveTape)
+    return;
+
+  SaveScoreTape(level_nr);
+
+  if (setup.ask_for_using_api_server)
+  {
+    setup.use_api_server =
+      Request("Upload your score and tape to the high score server?", REQ_ASK);
+
+    if (!setup.use_api_server)
+      Request("Not using high score server! Use setup menu to enable again!",
+             REQ_CONFIRM);
+
+    runtime.use_api_server = setup.use_api_server;
+
+    // after asking for using API server once, do not ask again
+    setup.ask_for_using_api_server = FALSE;
+
+    SaveSetup_ServerSetup();
+  }
+
+  SaveServerScore(level_nr, tape_saved);
+}
+
+void MergeServerScore(void)
+{
+  struct ScoreEntry last_added_entry;
+  boolean one_per_name = FALSE;
+  int i;
+
+  if (scores.last_added >= 0)
+    last_added_entry = scores.entry[scores.last_added];
+
+  for (i = 0; i < server_scores.num_entries; i++)
   {
-    SaveScoreTape(level_nr);
-    SaveScore(level_nr);
+    int pos = addScoreEntry(&scores, &server_scores.entry[i], one_per_name);
+
+    if (pos >= 0 && pos <= scores.last_added)
+      scores.last_added++;
   }
 
-  return position;
+  if (scores.last_added >= MAX_SCORE_ENTRIES)
+  {
+    scores.last_added = MAX_SCORE_ENTRIES - 1;
+    scores.force_last_added = TRUE;
+
+    scores.entry[scores.last_added] = last_added_entry;
+  }
 }
 
 static int getElementMoveStepsizeExt(int x, int y, int direction)
@@ -5169,6 +5309,8 @@ static void ResetGfxFrame(int x, int y)
 
   if (graphic_info[graphic].anim_global_sync)
     GfxFrame[x][y] = FrameCounter;
+  else if (graphic_info[graphic].anim_global_anim_sync)
+    GfxFrame[x][y] = getGlobalAnimSyncFrame();
   else if (ANIM_MODE(graphic) == ANIM_CE_VALUE)
     GfxFrame[x][y] = CustomValue[x][y];
   else if (ANIM_MODE(graphic) == ANIM_CE_SCORE)
@@ -5397,7 +5539,7 @@ void DrawDynamite(int x, int y)
   else if (game.use_masked_elements)
     DrawLevelElement(x, y, EL_EMPTY);
 
-  frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
+  frame = getGraphicAnimationFrameXY(graphic, x, y);
 
   if (Back[x][y] || Store[x][y] || game.use_masked_elements)
     DrawGraphicThruMask(sx, sy, graphic, frame);
@@ -5475,7 +5617,7 @@ static void setScreenCenteredToAllPlayers(int *sx, int *sy)
   *sy = (sy1 + sy2) / 2;
 }
 
-static void DrawRelocateScreen(int old_x, int old_y, int x, int y, int move_dir,
+static void DrawRelocateScreen(int old_x, int old_y, int x, int y,
                               boolean center_screen, boolean quick_relocation)
 {
   unsigned int frame_delay_value_old = GetVideoFrameDelay();
@@ -5640,13 +5782,13 @@ static void RelocatePlayer(int jx, int jy, int el_player_raw)
      possible that the relocation target field did not contain a player element,
      but a walkable element, to which the new player was relocated -- in this
      case, restore that (already initialized!) element on the player field */
-  if (!ELEM_IS_PLAYER(element))        // player may be set on walkable element
+  if (!IS_PLAYER_ELEMENT(element))     // player may be set on walkable element
   {
     Tile[jx][jy] = element;    // restore previously existing element
   }
 
   // only visually relocate centered player
-  DrawRelocateScreen(old_jx, old_jy, player->jx, player->jy, player->MovDir,
+  DrawRelocateScreen(old_jx, old_jy, player->jx, player->jy,
                     FALSE, level.instant_relocation);
 
   TestIfPlayerTouchesBadThing(jx, jy);
@@ -5810,7 +5952,7 @@ static void Explode(int ex, int ey, int phase, int mode)
 
       // !!! check this case -- currently needed for rnd_rado_negundo_v,
       // !!! levels 015 018 019 020 021 022 023 026 027 028 !!!
-      else if (ELEM_IS_PLAYER(center_element))
+      else if (IS_PLAYER_ELEMENT(center_element))
        Store[x][y] = EL_EMPTY;
       else if (center_element == EL_YAMYAM)
        Store[x][y] = level.yamyam_content[game.yamyam_content_nr].e[xx][yy];
@@ -5902,6 +6044,10 @@ static void Explode(int ex, int ey, int phase, int mode)
       return;
   }
 
+  // this can happen if the player was just killed by an explosion
+  if (GfxElement[x][y] == EL_UNDEFINED)
+    GfxElement[x][y] = EL_EMPTY;
+
   if (phase == last_phase)
   {
     int element;
@@ -5950,13 +6096,13 @@ static void Explode(int ex, int ey, int phase, int mode)
     if (IS_PLAYER(x, y) && !PLAYERINFO(x, y)->present)
       StorePlayer[x][y] = 0;
 
-    if (ELEM_IS_PLAYER(element))
+    if (IS_PLAYER_ELEMENT(element))
       RelocatePlayer(x, y, element);
   }
   else if (IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
   {
     int graphic = el_act2img(GfxElement[x][y], ACTION_EXPLODING);
-    int frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
+    int frame = getGraphicAnimationFrameXY(graphic, x, y);
 
     if (phase == delay)
       TEST_DrawLevelFieldCrumbled(x, y);
@@ -5968,11 +6114,11 @@ static void Explode(int ex, int ey, int phase, int mode)
     }
     else if (IS_WALKABLE_UNDER(Back[x][y]))
     {
-      DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
+      DrawLevelGraphic(x, y, graphic, frame);
       DrawLevelElementThruMask(x, y, Back[x][y]);
     }
     else if (!IS_WALKABLE_INSIDE(Back[x][y]))
-      DrawScreenGraphic(SCREENX(x), SCREENY(y), graphic, frame);
+      DrawLevelGraphic(x, y, graphic, frame);
   }
 }
 
@@ -5983,13 +6129,7 @@ static void DynaExplode(int ex, int ey)
   int dynabomb_size = 1;
   boolean dynabomb_xl = FALSE;
   struct PlayerInfo *player;
-  static int xy[4][2] =
-  {
-    { 0, -1 },
-    { -1, 0 },
-    { +1, 0 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_topdown;
 
   if (IS_ACTIVE_BOMB(dynabomb_element))
   {
@@ -6005,8 +6145,8 @@ static void DynaExplode(int ex, int ey)
   {
     for (j = 1; j <= dynabomb_size; j++)
     {
-      int x = ex + j * xy[i][0];
-      int y = ey + j * xy[i][1];
+      int x = ex + j * xy[i].x;
+      int y = ey + j * xy[i].y;
       int element;
 
       if (!IN_LEV_FIELD(x, y) || IS_INDESTRUCTIBLE(Tile[x][y]))
@@ -6287,7 +6427,7 @@ static void ToggleBeltSwitch(int x, int y)
   }
 }
 
-static void ToggleSwitchgateSwitch(int x, int y)
+static void ToggleSwitchgateSwitch(void)
 {
   int xx, yy;
 
@@ -6767,7 +6907,7 @@ static void Impact(int x, int y)
                 smashed == EL_DC_SWITCHGATE_SWITCH_UP ||
                 smashed == EL_DC_SWITCHGATE_SWITCH_DOWN)
        {
-         ToggleSwitchgateSwitch(x, y + 1);
+         ToggleSwitchgateSwitch();
        }
        else if (smashed == EL_LIGHT_SWITCH ||
                 smashed == EL_LIGHT_SWITCH_ACTIVE)
@@ -7141,18 +7281,12 @@ static void TurnRoundExt(int x, int y)
     if (element == EL_PENGUIN)
     {
       int i;
-      static int xy[4][2] =
-      {
-       { 0, -1 },
-       { -1, 0 },
-       { +1, 0 },
-       { 0, +1 }
-      };
+      struct XY *xy = xy_topdown;
 
       for (i = 0; i < NUM_DIRECTIONS; i++)
       {
-       int ex = x + xy[i][0];
-       int ey = y + xy[i][1];
+       int ex = x + xy[i].x;
+       int ey = y + xy[i].y;
 
        if (IN_LEV_FIELD(ex, ey) && (Tile[ex][ey] == EL_EXIT_OPEN ||
                                     Tile[ex][ey] == EL_EM_EXIT_OPEN ||
@@ -7551,25 +7685,13 @@ static void TurnRoundExt(int x, int y)
   }
   else if (move_pattern & MV_MAZE_RUNNER_STYLE)
   {
-    static int test_xy[7][2] =
-    {
-      { 0, -1 },
-      { -1, 0 },
-      { +1, 0 },
-      { 0, +1 },
-      { 0, -1 },
-      { -1, 0 },
-      { +1, 0 },
-    };
-    static int test_dir[7] =
+    struct XY *test_xy = xy_topdown;
+    static int test_dir[4] =
     {
       MV_UP,
       MV_LEFT,
       MV_RIGHT,
-      MV_DOWN,
-      MV_UP,
-      MV_LEFT,
-      MV_RIGHT,
+      MV_DOWN
     };
     boolean hunter_mode = (move_pattern == MV_MAZE_HUNTER);
     int move_preference = -1000000;    // start with very low preference
@@ -7579,11 +7701,12 @@ static void TurnRoundExt(int x, int y)
 
     for (i = 0; i < NUM_DIRECTIONS; i++)
     {
-      int move_dir = test_dir[start_test + i];
+      int j = (start_test + i) % 4;
+      int move_dir = test_dir[j];
       int move_dir_preference;
 
-      xx = x + test_xy[start_test + i][0];
-      yy = y + test_xy[start_test + i][1];
+      xx = x + test_xy[j].x;
+      yy = y + test_xy[j].y;
 
       if (hunter_mode && IN_LEV_FIELD(xx, yy) &&
          (IS_PLAYER(xx, yy) || Tile[xx][yy] == EL_PLAYER_IS_LEAVING))
@@ -8145,7 +8268,7 @@ static void StartMoving(int x, int y)
                       dir == MV_RIGHT  ? IMG_FLAMES_1_RIGHT :
                       dir == MV_UP     ? IMG_FLAMES_1_UP :
                       dir == MV_DOWN   ? IMG_FLAMES_1_DOWN : IMG_EMPTY);
-       int frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
+       int frame = getGraphicAnimationFrameXY(graphic, x, y);
 
        GfxAction[x][y] = ACTION_ATTACKING;
 
@@ -8183,7 +8306,7 @@ static void StartMoving(int x, int y)
            if (IN_SCR_FIELD(sx, sy))
            {
              TEST_DrawLevelFieldCrumbled(xx, yy);
-             DrawGraphic(sx, sy, flame_graphic, frame);
+             DrawScreenGraphic(sx, sy, flame_graphic, frame);
            }
          }
          else
@@ -8332,6 +8455,9 @@ static void StartMoving(int x, int y)
          GfxDir[x][y] = diagonal_move_dir;
          ChangeDelay[x][y] = change_delay;
 
+         if (Store[x][y] == EL_EMPTY)
+           Store[x][y] = GfxElementEmpty[x][y];
+
          graphic = el_act_dir2img(GfxElement[x][y], GfxAction[x][y],
                                   GfxDir[x][y]);
 
@@ -8736,7 +8862,7 @@ void ContinueMoving(int x, int y)
     if (GFX_CRUMBLED(Tile[x][y]))
       TEST_DrawLevelFieldCrumbledNeighbours(x, y);
 
-    if (ELEM_IS_PLAYER(move_leave_element))
+    if (IS_PLAYER_ELEMENT(move_leave_element))
       RelocatePlayer(x, y, move_leave_element);
   }
 
@@ -8838,18 +8964,12 @@ int AmoebaNeighbourNr(int ax, int ay)
   int i;
   int element = Tile[ax][ay];
   int group_nr = 0;
-  static int xy[4][2] =
-  {
-    { 0, -1 },
-    { -1, 0 },
-    { +1, 0 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_topdown;
 
   for (i = 0; i < NUM_DIRECTIONS; i++)
   {
-    int x = ax + xy[i][0];
-    int y = ay + xy[i][1];
+    int x = ax + xy[i].x;
+    int y = ay + xy[i].y;
 
     if (!IN_LEV_FIELD(x, y))
       continue;
@@ -8865,21 +8985,15 @@ static void AmoebaMerge(int ax, int ay)
 {
   int i, x, y, xx, yy;
   int new_group_nr = AmoebaNr[ax][ay];
-  static int xy[4][2] =
-  {
-    { 0, -1 },
-    { -1, 0 },
-    { +1, 0 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_topdown;
 
   if (new_group_nr == 0)
     return;
 
   for (i = 0; i < NUM_DIRECTIONS; i++)
   {
-    x = ax + xy[i][0];
-    y = ay + xy[i][1];
+    x = ax + xy[i].x;
+    y = ay + xy[i].y;
 
     if (!IN_LEV_FIELD(x, y))
       continue;
@@ -8942,18 +9056,12 @@ void AmoebaToDiamond(int ax, int ay)
   }
   else
   {
-    static int xy[4][2] =
-    {
-      { 0, -1 },
-      { -1, 0 },
-      { +1, 0 },
-      { 0, +1 }
-    };
+    struct XY *xy = xy_topdown;
 
     for (i = 0; i < NUM_DIRECTIONS; i++)
     {
-      x = ax + xy[i][0];
-      y = ay + xy[i][1];
+      x = ax + xy[i].x;
+      y = ay + xy[i].y;
 
       if (!IN_LEV_FIELD(x, y))
        continue;
@@ -9008,17 +9116,16 @@ static void AmoebaToDiamondBD(int ax, int ay, int new_element)
 
 static void AmoebaGrowing(int x, int y)
 {
-  static unsigned int sound_delay = 0;
-  static unsigned int sound_delay_value = 0;
+  static DelayCounter sound_delay = { 0 };
 
   if (!MovDelay[x][y])         // start new growing cycle
   {
     MovDelay[x][y] = 7;
 
-    if (DelayReached(&sound_delay, sound_delay_value))
+    if (DelayReached(&sound_delay))
     {
       PlayLevelSoundElementAction(x, y, Store[x][y], ACTION_GROWING);
-      sound_delay_value = 30;
+      sound_delay.value = 30;
     }
   }
 
@@ -9030,7 +9137,7 @@ static void AmoebaGrowing(int x, int y)
       int frame = getGraphicAnimationFrame(IMG_AMOEBA_GROWING,
                                           6 - MovDelay[x][y]);
 
-      DrawGraphic(SCREENX(x), SCREENY(y), IMG_AMOEBA_GROWING, frame);
+      DrawLevelGraphic(x, y, IMG_AMOEBA_GROWING, frame);
     }
 
     if (!MovDelay[x][y])
@@ -9044,15 +9151,14 @@ static void AmoebaGrowing(int x, int y)
 
 static void AmoebaShrinking(int x, int y)
 {
-  static unsigned int sound_delay = 0;
-  static unsigned int sound_delay_value = 0;
+  static DelayCounter sound_delay = { 0 };
 
   if (!MovDelay[x][y])         // start new shrinking cycle
   {
     MovDelay[x][y] = 7;
 
-    if (DelayReached(&sound_delay, sound_delay_value))
-      sound_delay_value = 30;
+    if (DelayReached(&sound_delay))
+      sound_delay.value = 30;
   }
 
   if (MovDelay[x][y])          // wait some time before shrinking
@@ -9063,7 +9169,7 @@ static void AmoebaShrinking(int x, int y)
       int frame = getGraphicAnimationFrame(IMG_AMOEBA_SHRINKING,
                                           6 - MovDelay[x][y]);
 
-      DrawGraphic(SCREENX(x), SCREENY(y), IMG_AMOEBA_SHRINKING, frame);
+      DrawLevelGraphic(x, y, IMG_AMOEBA_SHRINKING, frame);
     }
 
     if (!MovDelay[x][y])
@@ -9085,13 +9191,7 @@ static void AmoebaReproduce(int ax, int ay)
   int graphic = el2img(element);
   int newax = ax, neway = ay;
   boolean can_drop = (element == EL_AMOEBA_WET || element == EL_EMC_DRIPPER);
-  static int xy[4][2] =
-  {
-    { 0, -1 },
-    { -1, 0 },
-    { +1, 0 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_topdown;
 
   if (!level.amoeba_speed && element != EL_EMC_DRIPPER)
   {
@@ -9116,8 +9216,8 @@ static void AmoebaReproduce(int ax, int ay)
   if (can_drop)                        // EL_AMOEBA_WET or EL_EMC_DRIPPER
   {
     int start = RND(4);
-    int x = ax + xy[start][0];
-    int y = ay + xy[start][1];
+    int x = ax + xy[start].x;
+    int y = ay + xy[start].y;
 
     if (!IN_LEV_FIELD(x, y))
       return;
@@ -9142,8 +9242,8 @@ static void AmoebaReproduce(int ax, int ay)
     for (i = 0; i < NUM_DIRECTIONS; i++)
     {
       int j = (start + i) % 4;
-      int x = ax + xy[j][0];
-      int y = ay + xy[j][1];
+      int x = ax + xy[j].x;
+      int y = ay + xy[j].y;
 
       if (!IN_LEV_FIELD(x, y))
        continue;
@@ -9317,7 +9417,7 @@ static void Life(int ax, int ay)
          num_neighbours <= life_parameter[3])
       {
        Tile[xx][yy] = element;
-       MovDelay[xx][yy] = (element == EL_GAME_OF_LIFE ? 0 : life_time-1);
+       MovDelay[xx][yy] = (element == EL_GAME_OF_LIFE ? 0 : life_time - 1);
        if (Tile[xx][yy] != old_element)
          TEST_DrawLevelField(xx, yy);
        Stop[xx][yy] = TRUE;
@@ -9565,7 +9665,7 @@ static void DrawTwinkleOnField(int x, int y)
   }
 }
 
-static void MauerWaechst(int x, int y)
+static void WallGrowing(int x, int y)
 {
   int delay = 6;
 
@@ -9581,7 +9681,7 @@ static void MauerWaechst(int x, int y)
       int graphic = el_dir2img(Tile[x][y], GfxDir[x][y]);
       int frame = getGraphicAnimationFrame(graphic, 17 - MovDelay[x][y]);
 
-      DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
+      DrawLevelGraphic(x, y, graphic, frame);
     }
 
     if (!MovDelay[x][y])
@@ -9615,15 +9715,59 @@ static void MauerWaechst(int x, int y)
   }
 }
 
-static void MauerAbleger(int ax, int ay)
+static void CheckWallGrowing(int ax, int ay)
 {
   int element = Tile[ax][ay];
   int graphic = el2img(element);
-  boolean oben_frei = FALSE, unten_frei = FALSE;
-  boolean links_frei = FALSE, rechts_frei = FALSE;
-  boolean oben_massiv = FALSE, unten_massiv = FALSE;
-  boolean links_massiv = FALSE, rechts_massiv = FALSE;
-  boolean new_wall = FALSE;
+  boolean free_top    = FALSE;
+  boolean free_bottom = FALSE;
+  boolean free_left   = FALSE;
+  boolean free_right  = FALSE;
+  boolean stop_top    = FALSE;
+  boolean stop_bottom = FALSE;
+  boolean stop_left   = FALSE;
+  boolean stop_right  = FALSE;
+  boolean new_wall    = FALSE;
+
+  boolean is_steelwall  = (element == EL_EXPANDABLE_STEELWALL_HORIZONTAL ||
+                          element == EL_EXPANDABLE_STEELWALL_VERTICAL ||
+                          element == EL_EXPANDABLE_STEELWALL_ANY);
+
+  boolean grow_vertical   = (element == EL_EXPANDABLE_WALL_VERTICAL ||
+                            element == EL_EXPANDABLE_WALL_ANY ||
+                            element == EL_EXPANDABLE_STEELWALL_VERTICAL ||
+                            element == EL_EXPANDABLE_STEELWALL_ANY);
+
+  boolean grow_horizontal = (element == EL_EXPANDABLE_WALL_HORIZONTAL ||
+                            element == EL_EXPANDABLE_WALL_ANY ||
+                            element == EL_EXPANDABLE_WALL ||
+                            element == EL_BD_EXPANDABLE_WALL ||
+                            element == EL_EXPANDABLE_STEELWALL_HORIZONTAL ||
+                            element == EL_EXPANDABLE_STEELWALL_ANY);
+
+  boolean stop_vertical   = (element == EL_EXPANDABLE_WALL_VERTICAL ||
+                            element == EL_EXPANDABLE_STEELWALL_VERTICAL);
+
+  boolean stop_horizontal = (element == EL_EXPANDABLE_WALL_HORIZONTAL ||
+                            element == EL_EXPANDABLE_WALL ||
+                            element == EL_EXPANDABLE_STEELWALL_HORIZONTAL);
+
+  int wall_growing = (is_steelwall ?
+                     EL_EXPANDABLE_STEELWALL_GROWING :
+                     EL_EXPANDABLE_WALL_GROWING);
+
+  int gfx_wall_growing_up    = (is_steelwall ?
+                               IMG_EXPANDABLE_STEELWALL_GROWING_UP :
+                               IMG_EXPANDABLE_WALL_GROWING_UP);
+  int gfx_wall_growing_down  = (is_steelwall ?
+                               IMG_EXPANDABLE_STEELWALL_GROWING_DOWN :
+                               IMG_EXPANDABLE_WALL_GROWING_DOWN);
+  int gfx_wall_growing_left  = (is_steelwall ?
+                               IMG_EXPANDABLE_STEELWALL_GROWING_LEFT :
+                               IMG_EXPANDABLE_WALL_GROWING_LEFT);
+  int gfx_wall_growing_right = (is_steelwall ?
+                               IMG_EXPANDABLE_STEELWALL_GROWING_RIGHT :
+                               IMG_EXPANDABLE_WALL_GROWING_RIGHT);
 
   if (IS_ANIMATED(graphic))
     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
@@ -9638,188 +9782,84 @@ static void MauerAbleger(int ax, int ay)
       return;
   }
 
-  if (IN_LEV_FIELD(ax, ay-1) && IS_FREE(ax, ay-1))
-    oben_frei = TRUE;
-  if (IN_LEV_FIELD(ax, ay+1) && IS_FREE(ax, ay+1))
-    unten_frei = TRUE;
-  if (IN_LEV_FIELD(ax-1, ay) && IS_FREE(ax-1, ay))
-    links_frei = TRUE;
-  if (IN_LEV_FIELD(ax+1, ay) && IS_FREE(ax+1, ay))
-    rechts_frei = TRUE;
+  if (IN_LEV_FIELD(ax, ay - 1) && IS_FREE(ax, ay - 1))
+    free_top = TRUE;
+  if (IN_LEV_FIELD(ax, ay + 1) && IS_FREE(ax, ay + 1))
+    free_bottom = TRUE;
+  if (IN_LEV_FIELD(ax - 1, ay) && IS_FREE(ax - 1, ay))
+    free_left = TRUE;
+  if (IN_LEV_FIELD(ax + 1, ay) && IS_FREE(ax + 1, ay))
+    free_right = TRUE;
 
-  if (element == EL_EXPANDABLE_WALL_VERTICAL ||
-      element == EL_EXPANDABLE_WALL_ANY)
+  if (grow_vertical)
   {
-    if (oben_frei)
+    if (free_top)
     {
-      Tile[ax][ay-1] = EL_EXPANDABLE_WALL_GROWING;
-      Store[ax][ay-1] = element;
-      GfxDir[ax][ay-1] = MovDir[ax][ay-1] = MV_UP;
-      if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay-1)))
-       DrawGraphic(SCREENX(ax), SCREENY(ay - 1),
-                   IMG_EXPANDABLE_WALL_GROWING_UP, 0);
-      new_wall = TRUE;
-    }
-    if (unten_frei)
-    {
-      Tile[ax][ay+1] = EL_EXPANDABLE_WALL_GROWING;
-      Store[ax][ay+1] = element;
-      GfxDir[ax][ay+1] = MovDir[ax][ay+1] = MV_DOWN;
-      if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay+1)))
-       DrawGraphic(SCREENX(ax), SCREENY(ay + 1),
-                   IMG_EXPANDABLE_WALL_GROWING_DOWN, 0);
-      new_wall = TRUE;
-    }
-  }
+      Tile[ax][ay - 1] = wall_growing;
+      Store[ax][ay - 1] = element;
+      GfxDir[ax][ay - 1] = MovDir[ax][ay - 1] = MV_UP;
 
-  if (element == EL_EXPANDABLE_WALL_HORIZONTAL ||
-      element == EL_EXPANDABLE_WALL_ANY ||
-      element == EL_EXPANDABLE_WALL ||
-      element == EL_BD_EXPANDABLE_WALL)
-  {
-    if (links_frei)
-    {
-      Tile[ax-1][ay] = EL_EXPANDABLE_WALL_GROWING;
-      Store[ax-1][ay] = element;
-      GfxDir[ax-1][ay] = MovDir[ax-1][ay] = MV_LEFT;
-      if (IN_SCR_FIELD(SCREENX(ax-1), SCREENY(ay)))
-       DrawGraphic(SCREENX(ax - 1), SCREENY(ay),
-                   IMG_EXPANDABLE_WALL_GROWING_LEFT, 0);
-      new_wall = TRUE;
-    }
+      if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay - 1)))
+       DrawLevelGraphic(ax, ay - 1, gfx_wall_growing_up, 0);
 
-    if (rechts_frei)
-    {
-      Tile[ax+1][ay] = EL_EXPANDABLE_WALL_GROWING;
-      Store[ax+1][ay] = element;
-      GfxDir[ax+1][ay] = MovDir[ax+1][ay] = MV_RIGHT;
-      if (IN_SCR_FIELD(SCREENX(ax+1), SCREENY(ay)))
-       DrawGraphic(SCREENX(ax + 1), SCREENY(ay),
-                   IMG_EXPANDABLE_WALL_GROWING_RIGHT, 0);
       new_wall = TRUE;
     }
-  }
-
-  if (element == EL_EXPANDABLE_WALL && (links_frei || rechts_frei))
-    TEST_DrawLevelField(ax, ay);
-
-  if (!IN_LEV_FIELD(ax, ay-1) || IS_WALL(Tile[ax][ay-1]))
-    oben_massiv = TRUE;
-  if (!IN_LEV_FIELD(ax, ay+1) || IS_WALL(Tile[ax][ay+1]))
-    unten_massiv = TRUE;
-  if (!IN_LEV_FIELD(ax-1, ay) || IS_WALL(Tile[ax-1][ay]))
-    links_massiv = TRUE;
-  if (!IN_LEV_FIELD(ax+1, ay) || IS_WALL(Tile[ax+1][ay]))
-    rechts_massiv = TRUE;
-
-  if (((oben_massiv && unten_massiv) ||
-       element == EL_EXPANDABLE_WALL_HORIZONTAL ||
-       element == EL_EXPANDABLE_WALL) &&
-      ((links_massiv && rechts_massiv) ||
-       element == EL_EXPANDABLE_WALL_VERTICAL))
-    Tile[ax][ay] = EL_WALL;
-
-  if (new_wall)
-    PlayLevelSoundAction(ax, ay, ACTION_GROWING);
-}
-
-static void MauerAblegerStahl(int ax, int ay)
-{
-  int element = Tile[ax][ay];
-  int graphic = el2img(element);
-  boolean oben_frei = FALSE, unten_frei = FALSE;
-  boolean links_frei = FALSE, rechts_frei = FALSE;
-  boolean oben_massiv = FALSE, unten_massiv = FALSE;
-  boolean links_massiv = FALSE, rechts_massiv = FALSE;
-  boolean new_wall = FALSE;
-
-  if (IS_ANIMATED(graphic))
-    DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
 
-  if (!MovDelay[ax][ay])       // start building new wall
-    MovDelay[ax][ay] = 6;
-
-  if (MovDelay[ax][ay])                // wait some time before building new wall
-  {
-    MovDelay[ax][ay]--;
-    if (MovDelay[ax][ay])
-      return;
-  }
+    if (free_bottom)
+    {
+      Tile[ax][ay + 1] = wall_growing;
+      Store[ax][ay + 1] = element;
+      GfxDir[ax][ay + 1] = MovDir[ax][ay + 1] = MV_DOWN;
 
-  if (IN_LEV_FIELD(ax, ay-1) && IS_FREE(ax, ay-1))
-    oben_frei = TRUE;
-  if (IN_LEV_FIELD(ax, ay+1) && IS_FREE(ax, ay+1))
-    unten_frei = TRUE;
-  if (IN_LEV_FIELD(ax-1, ay) && IS_FREE(ax-1, ay))
-    links_frei = TRUE;
-  if (IN_LEV_FIELD(ax+1, ay) && IS_FREE(ax+1, ay))
-    rechts_frei = TRUE;
+      if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay + 1)))
+       DrawLevelGraphic(ax, ay + 1, gfx_wall_growing_down, 0);
 
-  if (element == EL_EXPANDABLE_STEELWALL_VERTICAL ||
-      element == EL_EXPANDABLE_STEELWALL_ANY)
-  {
-    if (oben_frei)
-    {
-      Tile[ax][ay-1] = EL_EXPANDABLE_STEELWALL_GROWING;
-      Store[ax][ay-1] = element;
-      GfxDir[ax][ay-1] = MovDir[ax][ay-1] = MV_UP;
-      if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay-1)))
-       DrawGraphic(SCREENX(ax), SCREENY(ay - 1),
-                   IMG_EXPANDABLE_STEELWALL_GROWING_UP, 0);
-      new_wall = TRUE;
-    }
-    if (unten_frei)
-    {
-      Tile[ax][ay+1] = EL_EXPANDABLE_STEELWALL_GROWING;
-      Store[ax][ay+1] = element;
-      GfxDir[ax][ay+1] = MovDir[ax][ay+1] = MV_DOWN;
-      if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay+1)))
-       DrawGraphic(SCREENX(ax), SCREENY(ay + 1),
-                   IMG_EXPANDABLE_STEELWALL_GROWING_DOWN, 0);
       new_wall = TRUE;
     }
   }
 
-  if (element == EL_EXPANDABLE_STEELWALL_HORIZONTAL ||
-      element == EL_EXPANDABLE_STEELWALL_ANY)
+  if (grow_horizontal)
   {
-    if (links_frei)
+    if (free_left)
     {
-      Tile[ax-1][ay] = EL_EXPANDABLE_STEELWALL_GROWING;
-      Store[ax-1][ay] = element;
-      GfxDir[ax-1][ay] = MovDir[ax-1][ay] = MV_LEFT;
-      if (IN_SCR_FIELD(SCREENX(ax-1), SCREENY(ay)))
-       DrawGraphic(SCREENX(ax - 1), SCREENY(ay),
-                   IMG_EXPANDABLE_STEELWALL_GROWING_LEFT, 0);
+      Tile[ax - 1][ay] = wall_growing;
+      Store[ax - 1][ay] = element;
+      GfxDir[ax - 1][ay] = MovDir[ax - 1][ay] = MV_LEFT;
+
+      if (IN_SCR_FIELD(SCREENX(ax - 1), SCREENY(ay)))
+       DrawLevelGraphic(ax - 1, ay, gfx_wall_growing_left, 0);
+
       new_wall = TRUE;
     }
 
-    if (rechts_frei)
+    if (free_right)
     {
-      Tile[ax+1][ay] = EL_EXPANDABLE_STEELWALL_GROWING;
-      Store[ax+1][ay] = element;
-      GfxDir[ax+1][ay] = MovDir[ax+1][ay] = MV_RIGHT;
-      if (IN_SCR_FIELD(SCREENX(ax+1), SCREENY(ay)))
-       DrawGraphic(SCREENX(ax + 1), SCREENY(ay),
-                   IMG_EXPANDABLE_STEELWALL_GROWING_RIGHT, 0);
+      Tile[ax + 1][ay] = wall_growing;
+      Store[ax + 1][ay] = element;
+      GfxDir[ax + 1][ay] = MovDir[ax + 1][ay] = MV_RIGHT;
+
+      if (IN_SCR_FIELD(SCREENX(ax + 1), SCREENY(ay)))
+       DrawLevelGraphic(ax + 1, ay, gfx_wall_growing_right, 0);
+
       new_wall = TRUE;
     }
   }
 
-  if (!IN_LEV_FIELD(ax, ay-1) || IS_WALL(Tile[ax][ay-1]))
-    oben_massiv = TRUE;
-  if (!IN_LEV_FIELD(ax, ay+1) || IS_WALL(Tile[ax][ay+1]))
-    unten_massiv = TRUE;
-  if (!IN_LEV_FIELD(ax-1, ay) || IS_WALL(Tile[ax-1][ay]))
-    links_massiv = TRUE;
-  if (!IN_LEV_FIELD(ax+1, ay) || IS_WALL(Tile[ax+1][ay]))
-    rechts_massiv = TRUE;
+  if (element == EL_EXPANDABLE_WALL && (free_left || free_right))
+    TEST_DrawLevelField(ax, ay);
 
-  if (((oben_massiv && unten_massiv) ||
-       element == EL_EXPANDABLE_STEELWALL_HORIZONTAL) &&
-      ((links_massiv && rechts_massiv) ||
-       element == EL_EXPANDABLE_STEELWALL_VERTICAL))
-    Tile[ax][ay] = EL_STEELWALL;
+  if (!IN_LEV_FIELD(ax, ay - 1) || IS_WALL(Tile[ax][ay - 1]))
+    stop_top = TRUE;
+  if (!IN_LEV_FIELD(ax, ay + 1) || IS_WALL(Tile[ax][ay + 1]))
+    stop_bottom = TRUE;
+  if (!IN_LEV_FIELD(ax - 1, ay) || IS_WALL(Tile[ax - 1][ay]))
+    stop_left = TRUE;
+  if (!IN_LEV_FIELD(ax + 1, ay) || IS_WALL(Tile[ax + 1][ay]))
+    stop_right = TRUE;
+
+  if (((stop_top && stop_bottom) || stop_horizontal) &&
+      ((stop_left && stop_right) || stop_vertical))
+    Tile[ax][ay] = EL_WALL;
 
   if (new_wall)
     PlayLevelSoundAction(ax, ay, ACTION_GROWING);
@@ -9829,19 +9869,14 @@ static void CheckForDragon(int x, int y)
 {
   int i, j;
   boolean dragon_found = FALSE;
-  static int xy[4][2] =
-  {
-    { 0, -1 },
-    { -1, 0 },
-    { +1, 0 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_topdown;
 
   for (i = 0; i < NUM_DIRECTIONS; i++)
   {
     for (j = 0; j < 4; j++)
     {
-      int xx = x + j * xy[i][0], yy = y + j * xy[i][1];
+      int xx = x + j * xy[i].x;
+      int yy = y + j * xy[i].y;
 
       if (IN_LEV_FIELD(xx, yy) &&
          (Tile[xx][yy] == EL_FLAMES || Tile[xx][yy] == EL_DRAGON))
@@ -9860,8 +9895,9 @@ static void CheckForDragon(int x, int y)
     {
       for (j = 0; j < 3; j++)
       {
-       int xx = x + j * xy[i][0], yy = y + j * xy[i][1];
-  
+       int xx = x + j * xy[i].x;
+       int yy = y + j * xy[i].y;
+
        if (IN_LEV_FIELD(xx, yy) && Tile[xx][yy] == EL_FLAMES)
        {
          Tile[xx][yy] = EL_EMPTY;
@@ -9891,18 +9927,12 @@ static void InitBuggyBase(int x, int y)
 static void WarnBuggyBase(int x, int y)
 {
   int i;
-  static int xy[4][2] =
-  {
-    { 0, -1 },
-    { -1, 0 },
-    { +1, 0 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_topdown;
 
   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 (IN_LEV_FIELD(xx, yy) && IS_PLAYER(xx, yy))
     {
@@ -10105,7 +10135,7 @@ static void ExecuteCustomElementAction(int x, int y, int element, int page)
 
        DisplayGameControlValues();
 
-       if (!TimeLeft && setup.time_limit)
+       if (!TimeLeft && game.time_limit)
          for (i = 0; i < MAX_PLAYERS; i++)
            KillPlayer(&stored_player[i]);
       }
@@ -10546,7 +10576,7 @@ static void CreateFieldExt(int x, int y, int element, boolean is_change)
   int previous_move_direction = MovDir[x][y];
   int last_ce_value = CustomValue[x][y];
   boolean player_explosion_protected = PLAYER_EXPLOSION_PROTECTED(x, y);
-  boolean new_element_is_player = ELEM_IS_PLAYER(new_element);
+  boolean new_element_is_player = IS_PLAYER_ELEMENT(new_element);
   boolean add_player_onto_element = (new_element_is_player &&
                                     new_element != EL_SOKOBAN_FIELD_PLAYER &&
                                     IS_WALKABLE(old_element));
@@ -10722,7 +10752,7 @@ static boolean ChangeElement(int x, int y, int element, int page)
          (change->replace_when == CP_WHEN_COLLECTIBLE  && is_collectible) ||
          (change->replace_when == CP_WHEN_REMOVABLE    && is_removable) ||
          (change->replace_when == CP_WHEN_DESTRUCTIBLE && is_destructible)) &&
-        !(IS_PLAYER(ex, ey) && ELEM_IS_PLAYER(content_element)));
+        !(IS_PLAYER(ex, ey) && IS_PLAYER_ELEMENT(content_element)));
 
       if (!can_replace[xx][yy])
        complete_replace = FALSE;
@@ -10784,6 +10814,10 @@ static boolean ChangeElement(int x, int y, int element, int page)
       Store[x][y] = EL_EMPTY;
     }
 
+    // special case: element changes to player (and may be kept if walkable)
+    if (IS_PLAYER_ELEMENT(target_element) && !level.keep_walkable_ce)
+      CreateElementFromChange(x, y, EL_EMPTY);
+
     CreateElementFromChange(x, y, target_element);
 
     PlayLevelSoundElementAction(x, y, element, ACTION_CHANGING);
@@ -11073,7 +11107,8 @@ static boolean CheckElementChangeExt(int x, int y,
        different to element changes that affect other elements to change on the
        whole playfield (which is handeld by CheckTriggeredElementChangeExt()) */
     boolean check_trigger_element =
-      (trigger_event == CE_TOUCHING_X ||
+      (trigger_event == CE_NEXT_TO_X ||
+       trigger_event == CE_TOUCHING_X ||
        trigger_event == CE_HITTING_X ||
        trigger_event == CE_HIT_BY_X ||
        trigger_event == CE_DIGGING_X); // this one was forgotten until 3.2.3
@@ -11500,6 +11535,35 @@ static void CheckLevelSolved(void)
   }
 }
 
+static void CheckLevelTime_StepCounter(void)
+{
+  int i;
+
+  TimePlayed++;
+
+  if (TimeLeft > 0)
+  {
+    TimeLeft--;
+
+    if (TimeLeft <= 10 && game.time_limit && !game.LevelSolved)
+      PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
+
+    game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
+
+    DisplayGameControlValues();
+
+    if (!TimeLeft && game.time_limit && !game.LevelSolved)
+      for (i = 0; i < MAX_PLAYERS; i++)
+       KillPlayer(&stored_player[i]);
+  }
+  else if (game.no_level_time_limit && !game.all_players_gone)
+  {
+    game_panel_controls[GAME_PANEL_TIME].value = TimePlayed;
+
+    DisplayGameControlValues();
+  }
+}
+
 static void CheckLevelTime(void)
 {
   int i;
@@ -11530,7 +11594,7 @@ static void CheckLevelTime(void)
       {
        TimeLeft--;
 
-       if (TimeLeft <= 10 && setup.time_limit)
+       if (TimeLeft <= 10 && game.time_limit)
          PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
 
        /* this does not make sense: game_panel_controls[GAME_PANEL_TIME].value
@@ -11538,7 +11602,7 @@ static void CheckLevelTime(void)
 
        game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
 
-       if (!TimeLeft && setup.time_limit)
+       if (!TimeLeft && game.time_limit)
        {
          if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
            game_em.lev->killed_out_of_time = TRUE;
@@ -11547,12 +11611,12 @@ static void CheckLevelTime(void)
              KillPlayer(&stored_player[i]);
        }
       }
-      else if (game.no_time_limit && !game.all_players_gone)
+      else if (game.no_level_time_limit && !game.all_players_gone)
       {
        game_panel_controls[GAME_PANEL_TIME].value = TimePlayed;
       }
 
-      game_em.lev->time = (game.no_time_limit ? TimePlayed : TimeLeft);
+      game_em.lev->time = (game.no_level_time_limit ? TimePlayed : TimeLeft);
     }
 
     if (tape.recording || tape.playing)
@@ -11622,6 +11686,9 @@ void StartGameActions(boolean init_network_game, boolean record_tape,
   if (record_tape)
     TapeStartRecording(new_random_seed);
 
+  if (setup.auto_pause_on_start && !tape.pausing)
+    TapeTogglePause(TAPE_TOGGLE_MANUAL);
+
   if (init_network_game)
   {
     SendToServer_LevelFile();
@@ -11654,7 +11721,7 @@ static void GameActionsExt(void)
     Warn("element '%s' caused endless loop in game engine",
         EL_NAME(recursion_loop_element));
 
-    RequestQuitGameExt(FALSE, level_editor_test_game, message);
+    RequestQuitGameExt(program.headless, level_editor_test_game, message);
 
     recursion_loop_detected = FALSE;   // if game should be continued
 
@@ -11929,25 +11996,23 @@ void GameActions(void)
 void GameActions_EM_Main(void)
 {
   byte effective_action[MAX_PLAYERS];
-  boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
   int i;
 
   for (i = 0; i < MAX_PLAYERS; i++)
     effective_action[i] = stored_player[i].effective_action;
 
-  GameActions_EM(effective_action, warp_mode);
+  GameActions_EM(effective_action);
 }
 
 void GameActions_SP_Main(void)
 {
   byte effective_action[MAX_PLAYERS];
-  boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
   int i;
 
   for (i = 0; i < MAX_PLAYERS; i++)
     effective_action[i] = stored_player[i].effective_action;
 
-  GameActions_SP(effective_action, warp_mode);
+  GameActions_SP(effective_action);
 
   for (i = 0; i < MAX_PLAYERS; i++)
   {
@@ -11960,9 +12025,7 @@ void GameActions_SP_Main(void)
 
 void GameActions_MM_Main(void)
 {
-  boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
-
-  GameActions_MM(local_player->effective_mouse_action, warp_mode);
+  GameActions_MM(local_player->effective_mouse_action);
 }
 
 void GameActions_RND_Main(void)
@@ -12026,7 +12089,7 @@ void GameActions_RND(void)
     game.centered_player_nr = game.centered_player_nr_next;
     game.set_centered_player = FALSE;
 
-    DrawRelocateScreen(0, 0, sx, sy, MV_NONE, TRUE, setup.quick_switch);
+    DrawRelocateScreen(0, 0, sx, sy, TRUE, setup.quick_switch);
     DrawGameDoorValues();
   }
 
@@ -12125,6 +12188,9 @@ void GameActions_RND(void)
        TEST_DrawLevelField(x, y);
 
        TestFieldAfterSnapping(x, y, element, move_direction, player_index_bit);
+
+       if (IS_ENVELOPE(element))
+         local_player->show_envelope = element;
       }
     }
 
@@ -12195,6 +12261,25 @@ void GameActions_RND(void)
     CheckElementChangeByMouse(x, y, element, CE_PRESSED_BY_MOUSE, ch_button);
     CheckTriggeredElementChangeByMouse(x, y, element, CE_MOUSE_PRESSED_ON_X,
                                       ch_button);
+
+    if (level.use_step_counter)
+    {
+      boolean counted_click = FALSE;
+
+      // element clicked that can change when clicked/pressed
+      if (CAN_CHANGE_OR_HAS_ACTION(element) &&
+         (HAS_ANY_CHANGE_EVENT(element, CE_CLICKED_BY_MOUSE) ||
+          HAS_ANY_CHANGE_EVENT(element, CE_PRESSED_BY_MOUSE)))
+       counted_click = TRUE;
+
+      // element clicked that can trigger change when clicked/pressed
+      if (trigger_events[element][CE_MOUSE_CLICKED_ON_X] ||
+         trigger_events[element][CE_MOUSE_PRESSED_ON_X])
+       counted_click = TRUE;
+
+      if (new_button && counted_click)
+       CheckLevelTime_StepCounter();
+    }
   }
 
   SCAN_PLAYFIELD(x, y)
@@ -12203,6 +12288,9 @@ void GameActions_RND(void)
     graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
     last_gfx_frame = GfxFrame[x][y];
 
+    if (element == EL_EMPTY)
+      graphic = el2img(GfxElementEmpty[x][y]);
+
     ResetGfxFrame(x, y);
 
     if (GfxFrame[x][y] != last_gfx_frame && !Stop[x][y])
@@ -12236,6 +12324,8 @@ void GameActions_RND(void)
       graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
     }
 
+    CheckNextToConditions(x, y);
+
     if (!IS_MOVING(x, y) && (CAN_FALL(element) || CAN_MOVE(element)))
     {
       StartMoving(x, y);
@@ -12296,17 +12386,16 @@ void GameActions_RND(void)
       CheckExitSP(x, y);
     else if (element == EL_EXPANDABLE_WALL_GROWING ||
             element == EL_EXPANDABLE_STEELWALL_GROWING)
-      MauerWaechst(x, y);
+      WallGrowing(x, y);
     else if (element == EL_EXPANDABLE_WALL ||
             element == EL_EXPANDABLE_WALL_HORIZONTAL ||
             element == EL_EXPANDABLE_WALL_VERTICAL ||
             element == EL_EXPANDABLE_WALL_ANY ||
-            element == EL_BD_EXPANDABLE_WALL)
-      MauerAbleger(x, y);
-    else if (element == EL_EXPANDABLE_STEELWALL_HORIZONTAL ||
+            element == EL_BD_EXPANDABLE_WALL ||
+            element == EL_EXPANDABLE_STEELWALL_HORIZONTAL ||
             element == EL_EXPANDABLE_STEELWALL_VERTICAL ||
             element == EL_EXPANDABLE_STEELWALL_ANY)
-      MauerAblegerStahl(x, y);
+      CheckWallGrowing(x, y);
     else if (element == EL_FLAMES)
       CheckForDragon(x, y);
     else if (element == EL_EXPLOSION)
@@ -12368,10 +12457,10 @@ void GameActions_RND(void)
           element == EL_ACID_SPLASH_LEFT ||
           element == EL_ACID_SPLASH_RIGHT))
       {
-       if ((IN_LEV_FIELD(x, y-1) && Tile[x][y-1] == EL_AMOEBA_WET) ||
-           (IN_LEV_FIELD(x-1, y) && Tile[x-1][y] == EL_AMOEBA_WET) ||
-           (IN_LEV_FIELD(x+1, y) && Tile[x+1][y] == EL_AMOEBA_WET) ||
-           (IN_LEV_FIELD(x, y+1) && Tile[x][y+1] == EL_AMOEBA_WET))
+       if ((IN_LEV_FIELD(x, y - 1) && Tile[x][y - 1] == EL_AMOEBA_WET) ||
+           (IN_LEV_FIELD(x - 1, y) && Tile[x - 1][y] == EL_AMOEBA_WET) ||
+           (IN_LEV_FIELD(x + 1, y) && Tile[x + 1][y] == EL_AMOEBA_WET) ||
+           (IN_LEV_FIELD(x, y + 1) && Tile[x][y + 1] == EL_AMOEBA_WET))
          Tile[x][y] = EL_AMOEBA_DROP;
       }
 
@@ -13009,7 +13098,7 @@ void ScrollPlayer(struct PlayerInfo *player, int mode)
 
   if (mode == SCROLL_INIT)
   {
-    player->actual_frame_counter = FrameCounter;
+    player->actual_frame_counter.count = FrameCounter;
     player->GfxPos = move_stepsize * (player->MovPos / move_stepsize);
 
     if ((player->block_last_field || player->block_delay_adjustment > 0) &&
@@ -13038,7 +13127,7 @@ void ScrollPlayer(struct PlayerInfo *player, int mode)
     if (player->MovPos != 0)   // player has not yet reached destination
       return;
   }
-  else if (!FrameReached(&player->actual_frame_counter, 1))
+  else if (!FrameReached(&player->actual_frame_counter))
     return;
 
   if (player->MovPos != 0)
@@ -13067,9 +13156,6 @@ void ScrollPlayer(struct PlayerInfo *player, int mode)
       }
     }
 
-    player->last_jx = jx;
-    player->last_jy = jy;
-
     if (Tile[jx][jy] == EL_EXIT_OPEN ||
        Tile[jx][jy] == EL_EM_EXIT_OPEN ||
        Tile[jx][jy] == EL_EM_EXIT_OPENING ||
@@ -13087,6 +13173,9 @@ void ScrollPlayer(struct PlayerInfo *player, int mode)
        LevelSolved();
     }
 
+    player->last_jx = jx;
+    player->last_jy = jy;
+
     // this breaks one level: "machine", level 000
     {
       int move_direction = player->MovDir;
@@ -13148,33 +13237,7 @@ void ScrollPlayer(struct PlayerInfo *player, int mode)
     }
 
     if (level.use_step_counter)
-    {
-      int i;
-
-      TimePlayed++;
-
-      if (TimeLeft > 0)
-      {
-       TimeLeft--;
-
-       if (TimeLeft <= 10 && setup.time_limit && !game.LevelSolved)
-         PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
-
-       game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
-
-       DisplayGameControlValues();
-
-       if (!TimeLeft && setup.time_limit && !game.LevelSolved)
-         for (i = 0; i < MAX_PLAYERS; i++)
-           KillPlayer(&stored_player[i]);
-      }
-      else if (game.no_time_limit && !game.all_players_gone)
-      {
-       game_panel_controls[GAME_PANEL_TIME].value = TimePlayed;
-
-       DisplayGameControlValues();
-      }
-    }
+      CheckLevelTime_StepCounter();
 
     if (tape.single_step && tape.recording && !tape.pausing &&
        !player->programmed_action)
@@ -13187,20 +13250,22 @@ void ScrollPlayer(struct PlayerInfo *player, int mode)
 
 void ScrollScreen(struct PlayerInfo *player, int mode)
 {
-  static unsigned int screen_frame_counter = 0;
+  static DelayCounter screen_frame_counter = { 0 };
 
   if (mode == SCROLL_INIT)
   {
     // set scrolling step size according to actual player's moving speed
     ScrollStepSize = TILEX / player->move_delay_value;
 
-    screen_frame_counter = FrameCounter;
+    screen_frame_counter.count = FrameCounter;
+    screen_frame_counter.value = 1;
+
     ScreenMovDir = player->MovDir;
     ScreenMovPos = player->MovPos;
     ScreenGfxPos = ScrollStepSize * (ScreenMovPos / ScrollStepSize);
     return;
   }
-  else if (!FrameReached(&screen_frame_counter, 1))
+  else if (!FrameReached(&screen_frame_counter))
     return;
 
   if (ScreenMovPos)
@@ -13213,15 +13278,73 @@ void ScrollScreen(struct PlayerInfo *player, int mode)
     ScreenMovDir = MV_NONE;
 }
 
-void TestIfPlayerTouchesCustomElement(int x, int y)
+void CheckNextToConditions(int x, int y)
 {
-  static int xy[4][2] =
+  int element = Tile[x][y];
+
+  if (IS_PLAYER(x, y))
+    TestIfPlayerNextToCustomElement(x, y);
+
+  if (CAN_CHANGE_OR_HAS_ACTION(element) &&
+      HAS_ANY_CHANGE_EVENT(element, CE_NEXT_TO_X))
+    TestIfElementNextToCustomElement(x, y);
+}
+
+void TestIfPlayerNextToCustomElement(int x, int y)
+{
+  struct XY *xy = xy_topdown;
+  static int trigger_sides[4][2] =
   {
-    { 0, -1 },
-    { -1, 0 },
-    { +1, 0 },
-    { 0, +1 }
+    // center side       border side
+    { CH_SIDE_TOP,     CH_SIDE_BOTTOM  },      // check top
+    { CH_SIDE_LEFT,    CH_SIDE_RIGHT   },      // check left
+    { CH_SIDE_RIGHT,   CH_SIDE_LEFT    },      // check right
+    { CH_SIDE_BOTTOM,  CH_SIDE_TOP     }       // check bottom
   };
+  int i;
+
+  if (!IS_PLAYER(x, y))
+    return;
+
+  struct PlayerInfo *player = PLAYERINFO(x, y);
+
+  if (player->is_moving)
+    return;
+
+  for (i = 0; i < NUM_DIRECTIONS; i++)
+  {
+    int xx = x + xy[i].x;
+    int yy = y + xy[i].y;
+    int border_side = trigger_sides[i][1];
+    int border_element;
+
+    if (!IN_LEV_FIELD(xx, yy))
+      continue;
+
+    if (IS_MOVING(xx, yy) || IS_BLOCKED(xx, yy))
+      continue;                // center and border element not connected
+
+    border_element = Tile[xx][yy];
+
+    CheckElementChangeByPlayer(xx, yy, border_element, CE_NEXT_TO_PLAYER,
+                               player->index_bit, border_side);
+    CheckTriggeredElementChangeByPlayer(xx, yy, border_element,
+                                        CE_PLAYER_NEXT_TO_X,
+                                        player->index_bit, border_side);
+
+    /* use player element that is initially defined in the level playfield,
+       not the player element that corresponds to the runtime player number
+       (example: a level that contains EL_PLAYER_3 as the only player would
+       incorrectly give EL_PLAYER_1 for "player->element_nr") */
+
+    CheckElementChangeBySide(xx, yy, border_element, player->initial_element,
+                             CE_NEXT_TO_X, border_side);
+  }
+}
+
+void TestIfPlayerTouchesCustomElement(int x, int y)
+{
+  struct XY *xy = xy_topdown;
   static int trigger_sides[4][2] =
   {
     // center side       border side
@@ -13242,8 +13365,8 @@ void TestIfPlayerTouchesCustomElement(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 center_side = trigger_sides[i][0];
     int border_side = trigger_sides[i][1];
     int border_element;
@@ -13313,15 +13436,48 @@ void TestIfPlayerTouchesCustomElement(int x, int y)
   }
 }
 
-void TestIfElementTouchesCustomElement(int x, int y)
+void TestIfElementNextToCustomElement(int x, int y)
 {
-  static int xy[4][2] =
+  struct XY *xy = xy_topdown;
+  static int trigger_sides[4][2] =
   {
-    { 0, -1 },
-    { -1, 0 },
-    { +1, 0 },
-    { 0, +1 }
+    // center side     border side
+    { CH_SIDE_TOP,     CH_SIDE_BOTTOM  },      // check top
+    { CH_SIDE_LEFT,    CH_SIDE_RIGHT   },      // check left
+    { CH_SIDE_RIGHT,   CH_SIDE_LEFT    },      // check right
+    { CH_SIDE_BOTTOM,  CH_SIDE_TOP     }       // check bottom
   };
+  int center_element = Tile[x][y];     // should always be non-moving!
+  int i;
+
+  if (IS_MOVING(x, y) || IS_BLOCKED(x, y))
+    return;
+
+  for (i = 0; i < NUM_DIRECTIONS; i++)
+  {
+    int xx = x + xy[i].x;
+    int yy = y + xy[i].y;
+    int border_side = trigger_sides[i][1];
+    int border_element;
+
+    if (!IN_LEV_FIELD(xx, yy))
+      continue;
+
+    if (IS_MOVING(xx, yy) || IS_BLOCKED(xx, yy))
+      continue;                        // center and border element not connected
+
+    border_element = Tile[xx][yy];
+
+    // check for change of center element (but change it only once)
+    if (CheckElementChangeBySide(x, y, center_element, border_element,
+                                 CE_NEXT_TO_X, border_side))
+      break;
+  }
+}
+
+void TestIfElementTouchesCustomElement(int x, int y)
+{
+  struct XY *xy = xy_topdown;
   static int trigger_sides[4][2] =
   {
     // center side     border side
@@ -13344,8 +13500,8 @@ void TestIfElementTouchesCustomElement(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 border_element;
 
     border_element_old[i] = -1;
@@ -13367,8 +13523,8 @@ void TestIfElementTouchesCustomElement(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 center_side = trigger_sides[i][0];
     int border_element = border_element_old[i];
 
@@ -13384,8 +13540,8 @@ void TestIfElementTouchesCustomElement(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 border_side = trigger_sides[i][1];
     int border_element = border_element_old[i];
 
@@ -13472,13 +13628,7 @@ void TestIfGoodThingHitsBadThing(int good_x, int good_y, int good_move_dir)
   int i, kill_x = -1, kill_y = -1;
 
   int bad_element = -1;
-  static int test_xy[4][2] =
-  {
-    { 0, -1 },
-    { -1, 0 },
-    { +1, 0 },
-    { 0, +1 }
-  };
+  struct XY *test_xy = xy_topdown;
   static int test_dir[4] =
   {
     MV_UP,
@@ -13491,8 +13641,8 @@ void TestIfGoodThingHitsBadThing(int good_x, int good_y, int good_move_dir)
   {
     int test_x, test_y, test_move_dir, test_element;
 
-    test_x = good_x + test_xy[i][0];
-    test_y = good_y + test_xy[i][1];
+    test_x = good_x + test_xy[i].x;
+    test_y = good_y + test_xy[i].y;
 
     if (!IN_LEV_FIELD(test_x, test_y))
       continue;
@@ -13537,13 +13687,7 @@ void TestIfBadThingHitsGoodThing(int bad_x, int bad_y, int bad_move_dir)
 {
   int i, kill_x = -1, kill_y = -1;
   int bad_element = Tile[bad_x][bad_y];
-  static int test_xy[4][2] =
-  {
-    { 0, -1 },
-    { -1, 0 },
-    { +1, 0 },
-    { 0, +1 }
-  };
+  struct XY *test_xy = xy_topdown;
   static int touch_dir[4] =
   {
     MV_LEFT | MV_RIGHT,
@@ -13566,8 +13710,8 @@ void TestIfBadThingHitsGoodThing(int bad_x, int bad_y, int bad_move_dir)
   {
     int test_x, test_y, test_move_dir, test_element;
 
-    test_x = bad_x + test_xy[i][0];
-    test_y = bad_y + test_xy[i][1];
+    test_x = bad_x + test_xy[i].x;
+    test_y = bad_y + test_xy[i].y;
 
     if (!IN_LEV_FIELD(test_x, test_y))
       continue;
@@ -13719,20 +13863,14 @@ void TestIfBadThingTouchesFriend(int x, int y)
 void TestIfBadThingTouchesOtherBadThing(int bad_x, int bad_y)
 {
   int i, kill_x = bad_x, kill_y = bad_y;
-  static int xy[4][2] =
-  {
-    { 0, -1 },
-    { -1, 0 },
-    { +1, 0 },
-    { 0, +1 }
-  };
+  struct XY *xy = xy_topdown;
 
   for (i = 0; i < NUM_DIRECTIONS; i++)
   {
     int x, y, element;
 
-    x = bad_x + xy[i][0];
-    y = bad_y + xy[i][1];
+    x = bad_x + xy[i].x;
+    y = bad_y + xy[i].y;
     if (!IN_LEV_FIELD(x, y))
       continue;
 
@@ -13908,7 +14046,11 @@ static void TestFieldAfterSnapping(int x, int y, int element, int direction,
   if (level.finish_dig_collect)
   {
     int dig_side = MV_DIR_OPPOSITE(direction);
+    int change_event = (IS_DIGGABLE(element) ? CE_PLAYER_DIGS_X :
+                       CE_PLAYER_COLLECTS_X);
 
+    CheckTriggeredElementChangeByPlayer(x, y, element, change_event,
+                                       player_index_bit, dig_side);
     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
                                        player_index_bit, dig_side);
   }
@@ -13991,7 +14133,6 @@ static int DigField(struct PlayerInfo *player,
       return MP_NO_ACTION;
     }
   }
-
   if (IS_TUBE(Back[jx][jy]) && game.engine_version >= VERSION_IDENT(2,2,0,0))
     old_element = Back[jx][jy];
 
@@ -14241,9 +14382,13 @@ static int DigField(struct PlayerInfo *player,
     }
     else if (element == EL_SHIELD_NORMAL || element == EL_SHIELD_DEADLY)
     {
-      player->shield_normal_time_left += level.shield_normal_time;
+      int shield_time = (element == EL_SHIELD_DEADLY ?
+                        level.shield_deadly_time :
+                        level.shield_normal_time);
+
+      player->shield_normal_time_left += shield_time;
       if (element == EL_SHIELD_DEADLY)
-       player->shield_deadly_time_left += level.shield_deadly_time;
+       player->shield_deadly_time_left += shield_time;
     }
     else if (element == EL_DYNAMITE ||
             element == EL_EM_DYNAMITE ||
@@ -14282,7 +14427,10 @@ static int DigField(struct PlayerInfo *player,
     }
     else if (IS_ENVELOPE(element))
     {
-      player->show_envelope = element;
+      boolean wait_for_snapping = (mode == DF_SNAP && level.block_snap_field);
+
+      if (!wait_for_snapping)
+       player->show_envelope = element;
     }
     else if (element == EL_EMC_LENSES)
     {
@@ -14469,7 +14617,7 @@ static int DigField(struct PlayerInfo *player,
       if (sokoban_task_solved &&
          game.sokoban_fields_still_needed == 0 &&
          game.sokoban_objects_still_needed == 0 &&
-         (game.emulation == EMU_SOKOBAN || level.auto_exit_sokoban))
+         level.auto_exit_sokoban)
       {
        game.players_still_needed = 0;
 
@@ -14560,7 +14708,7 @@ static int DigField(struct PlayerInfo *player,
             element == EL_DC_SWITCHGATE_SWITCH_UP ||
             element == EL_DC_SWITCHGATE_SWITCH_DOWN)
     {
-      ToggleSwitchgateSwitch(x, y);
+      ToggleSwitchgateSwitch();
     }
     else if (element == EL_LIGHT_SWITCH ||
             element == EL_LIGHT_SWITCH_ACTIVE)
@@ -14601,7 +14749,7 @@ static int DigField(struct PlayerInfo *player,
       if (level.time > 0 || level.use_time_orb_bug)
       {
        TimeLeft += level.time_orb_time;
-       game.no_time_limit = FALSE;
+       game.no_level_time_limit = FALSE;
 
        game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
 
@@ -15411,9 +15559,10 @@ void RequestQuitGameExt(boolean skip_request, boolean quick_quit, char *message)
     {
       // prevent short reactivation of overlay buttons while closing door
       SetOverlayActive(FALSE);
+      UnmapGameButtons();
 
       // door may still be open due to skipped or envelope style request
-      CloseDoor(DOOR_CLOSE_1);
+      CloseDoor(score_info_tape_play ? DOOR_CLOSE_ALL : DOOR_CLOSE_1);
     }
 
     if (network.enabled)
@@ -15446,7 +15595,7 @@ void RequestQuitGame(boolean escape_key_pressed)
   boolean quick_quit = ((escape_key_pressed && !ask_on_escape) ||
                        level_editor_test_game);
   boolean skip_request = (game.all_players_gone || !setup.ask_on_quit_game ||
-                         quick_quit);
+                         quick_quit || score_info_tape_play);
 
   RequestQuitGameExt(skip_request, quick_quit,
                     "Do you really want to quit the game?");
@@ -15693,7 +15842,7 @@ static ListNode *SaveEngineSnapshotBuffers(void)
   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
     SaveEngineSnapshotValues_SP(&buffers);
   if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
-    SaveEngineSnapshotValues_MM(&buffers);
+    SaveEngineSnapshotValues_MM();
 
   // save values stored in special snapshot structure
 
@@ -15758,6 +15907,7 @@ static ListNode *SaveEngineSnapshotBuffers(void)
 
   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxFrame));
   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxRandom));
+  SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxRandomStatic));
   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxElement));
   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxAction));
   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxDir));
@@ -16017,6 +16167,10 @@ void CreateGameButtons(void)
     int y = (is_touch_button ? pos->y : GDI_ACTIVE_POS(pos->y));
     int id = i;
 
+    // do not use touch buttons if overlay touch buttons are disabled
+    if (is_touch_button && !setup.touch.overlay_buttons)
+      continue;
+
     if (gfx->bitmap == NULL)
     {
       game_gadget[id] = NULL;
@@ -16099,12 +16253,18 @@ static void UnmapGameButtonsAtSamePosition(int id)
 
 static void UnmapGameButtonsAtSamePosition_All(void)
 {
-  if (setup.show_snapshot_buttons)
+  if (setup.show_load_save_buttons)
   {
     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_SAVE);
     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PAUSE2);
     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_LOAD);
   }
+  else if (setup.show_undo_redo_buttons)
+  {
+    UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_UNDO);
+    UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PAUSE2);
+    UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_REDO);
+  }
   else
   {
     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_STOP);
@@ -16117,17 +16277,13 @@ static void UnmapGameButtonsAtSamePosition_All(void)
   }
 }
 
-static void MapGameButtonsAtSamePosition(int id)
+void MapLoadSaveButtons(void)
 {
-  int i;
+  UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_LOAD);
+  UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_SAVE);
 
-  for (i = 0; i < NUM_GAME_BUTTONS; i++)
-    if (i != id &&
-       gamebutton_info[i].pos->x == gamebutton_info[id].pos->x &&
-       gamebutton_info[i].pos->y == gamebutton_info[id].pos->y)
-      MapGadget(game_gadget[i]);
-
-  UnmapGameButtonsAtSamePosition_All();
+  MapGadget(game_gadget[GAME_CTRL_ID_LOAD]);
+  MapGadget(game_gadget[GAME_CTRL_ID_SAVE]);
 }
 
 void MapUndoRedoButtons(void)
@@ -16139,15 +16295,6 @@ void MapUndoRedoButtons(void)
   MapGadget(game_gadget[GAME_CTRL_ID_REDO]);
 }
 
-void UnmapUndoRedoButtons(void)
-{
-  UnmapGadget(game_gadget[GAME_CTRL_ID_UNDO]);
-  UnmapGadget(game_gadget[GAME_CTRL_ID_REDO]);
-
-  MapGameButtonsAtSamePosition(GAME_CTRL_ID_UNDO);
-  MapGameButtonsAtSamePosition(GAME_CTRL_ID_REDO);
-}
-
 void ModifyPauseButtons(void)
 {
   static int ids[] =
@@ -16169,10 +16316,15 @@ static void MapGameButtonsExt(boolean on_tape)
   int i;
 
   for (i = 0; i < NUM_GAME_BUTTONS; i++)
-    if ((!on_tape || gamebutton_info[i].allowed_on_tape) &&
-       i != GAME_CTRL_ID_UNDO &&
-       i != GAME_CTRL_ID_REDO)
+  {
+    if ((i == GAME_CTRL_ID_UNDO ||
+        i == GAME_CTRL_ID_REDO) &&
+       game_status != GAME_MODE_PLAYING)
+      continue;
+
+    if (!on_tape || gamebutton_info[i].allowed_on_tape)
       MapGadget(game_gadget[i]);
+  }
 
   UnmapGameButtonsAtSamePosition_All();
 
@@ -16263,6 +16415,8 @@ static void GameUndoRedoExt(void)
   DrawVideoDisplay(VIDEO_STATE_FRAME_ON, FrameCounter);
   DrawVideoDisplay(VIDEO_STATE_1STEP(tape.single_step), 0);
 
+  ModifyPauseButtons();
+
   BackToFront();
 }
 
@@ -16271,8 +16425,12 @@ static void GameUndo(int steps)
   if (!CheckEngineSnapshotList())
     return;
 
+  int tape_property_bits = tape.property_bits;
+
   LoadEngineSnapshot_Undo(steps);
 
+  tape.property_bits |= tape_property_bits | TAPE_PROPERTY_SNAPSHOT;
+
   GameUndoRedoExt();
 }
 
@@ -16281,8 +16439,12 @@ static void GameRedo(int steps)
   if (!CheckEngineSnapshotList())
     return;
 
+  int tape_property_bits = tape.property_bits;
+
   LoadEngineSnapshot_Redo(steps);
 
+  tape.property_bits |= tape_property_bits | TAPE_PROPERTY_SNAPSHOT;
+
   GameUndoRedoExt();
 }
 
@@ -16302,13 +16464,7 @@ static void HandleGameButtonsExt(int id, int button)
     case GAME_CTRL_ID_STOP:
     case GAME_CTRL_ID_PANEL_STOP:
     case GAME_CTRL_ID_TOUCH_STOP:
-      if (game_status == GAME_MODE_MAIN)
-       break;
-
-      if (tape.playing)
-       TapeStop();
-      else
-       RequestQuitGame(FALSE);
+      TapeStopGame();
 
       break;