-#define ED_CHECKBUTTON_ID_CUSTOM_WALK_TO_OBJECT 17
-#define ED_CHECKBUTTON_ID_CUSTOM_CAN_MOVE 18
-#define ED_CHECKBUTTON_ID_CUSTOM_CAN_FALL 19
-#define ED_CHECKBUTTON_ID_CUSTOM_CAN_SMASH 20
-#define ED_CHECKBUTTON_ID_CUSTOM_SLIPPERY 21
-#define ED_CHECKBUTTON_ID_CUSTOM_DEADLY 22
-#define ED_CHECKBUTTON_ID_CUSTOM_INDESTRUCTIBLE 23
-#define ED_CHECKBUTTON_ID_CUSTOM_CAN_EXPLODE 24
-#define ED_CHECKBUTTON_ID_CUSTOM_EXPLODE_FIRE 25
-#define ED_CHECKBUTTON_ID_CUSTOM_EXPLODE_SMASH 26
-#define ED_CHECKBUTTON_ID_CUSTOM_EXPLODE_IMPACT 27
-#define ED_CHECKBUTTON_ID_CUSTOM_CAN_CHANGE 28
-#define ED_CHECKBUTTON_ID_CHANGE_DELAY 29
-#define ED_CHECKBUTTON_ID_CHANGE_BY_DIRECT_ACT 30
-#define ED_CHECKBUTTON_ID_CHANGE_BY_OTHER_ACT 31
-#define ED_CHECKBUTTON_ID_CHANGE_USE_EXPLOSION 32
-#define ED_CHECKBUTTON_ID_CHANGE_USE_CONTENT 33
-#define ED_CHECKBUTTON_ID_CHANGE_ONLY_COMPLETE 34
-#define ED_CHECKBUTTON_ID_CHANGE_USE_RANDOM 35
-
-#define ED_NUM_CHECKBUTTONS 36
+#define ED_CHECKBUTTON_ID_CUSTOM_GRAV_REACHABLE 17
+#define ED_CHECKBUTTON_ID_CUSTOM_WALK_TO_OBJECT 18
+#define ED_CHECKBUTTON_ID_CUSTOM_INDESTRUCTIBLE 19
+#define ED_CHECKBUTTON_ID_CUSTOM_CAN_MOVE 20
+#define ED_CHECKBUTTON_ID_CUSTOM_CAN_FALL 21
+#define ED_CHECKBUTTON_ID_CUSTOM_CAN_SMASH 22
+#define ED_CHECKBUTTON_ID_CUSTOM_SLIPPERY 23
+#define ED_CHECKBUTTON_ID_CUSTOM_DEADLY 24
+#define ED_CHECKBUTTON_ID_CUSTOM_CAN_EXPLODE 25
+#define ED_CHECKBUTTON_ID_CUSTOM_EXPLODE_FIRE 26
+#define ED_CHECKBUTTON_ID_CUSTOM_EXPLODE_SMASH 27
+#define ED_CHECKBUTTON_ID_CUSTOM_EXPLODE_IMPACT 28
+#define ED_CHECKBUTTON_ID_CUSTOM_CAN_CHANGE 29
+#define ED_CHECKBUTTON_ID_CHANGE_DELAY 30
+#define ED_CHECKBUTTON_ID_CHANGE_BY_DIRECT_ACT 31
+#define ED_CHECKBUTTON_ID_CHANGE_BY_OTHER_ACT 32
+#define ED_CHECKBUTTON_ID_CHANGE_USE_EXPLOSION 33
+#define ED_CHECKBUTTON_ID_CHANGE_USE_CONTENT 34
+#define ED_CHECKBUTTON_ID_CHANGE_ONLY_COMPLETE 35
+#define ED_CHECKBUTTON_ID_CHANGE_USE_RANDOM 36
+
+#define ED_NUM_CHECKBUTTONS 37