Usually crash your game.
895: LIQUID_COARSE_WATER
896: LIQUID_IMPOSTOR_LAKE
897: LIQUID_LAVA
898: LIQUID_STAGNANT_LAVA
Crash your game.
350: ITEM_CLIMBABLE_ROPE
383: ITEM_SPARK
403: ITEM_DMCRATE
Just don't work.
413: ITEM_WALLTORCHFLAME
417: ITEM_TORCHFLAME
419: ITEM_LAMPFLAME
421: ITEM_REDLANTERN_FLAME
367: ITEM_WEBSHOT
437: ITEM_OLMECCANNON_BOMBS
438: ITEM_OLMECCANNON_UFO
Just don't work.
835: LOGICAL_ARROW_TRAP_TRIGGER
836: LOGICAL_TOTEM_TRAP_TRIGGER
837: LOGICAL_JUNGLESPEAR_TRIGGER
838: LOGICAL_SPIKEBALL_TRIGGER
839: LOGICAL_CRUSHTRAP_TRIGGER
840: LOGICAL_TENTACLE_TRIGGER
870: LOGICAL_BIGSPEAR_TRIGGER
Glitch your character out of the map.
33: FLOOR_DOOR_EGGSHIP
34: FLOOR_DOOR_EGGSHIP_ATREZZO
35: FLOOR_DOOR_EGGSHIP_ROOM
Don't work unless you use the tab called Door to anywhere.
26: FLOOR_DOOR_LAYER
27: FLOOR_DOOR_LAYER_DROP_HELD
Usually just instantly break.
42: FLOOR_TOTEM_TRAP
44: FLOOR_LION_TRAP
Instantly breaks unless you spawn 2 side by side on the exact frame.
79: FLOOR_BIGSPEAR_TRAP
Instantly disappear.
360: ITEM_TOTEM_SPEAR
361: ITEM_JUNGLE_SPEAR_COSMETIC
362: ITEM_JUNGLE_SPEAR_DAMAGING
363: ITEM_LION_SPEAR
364: ITEM_BIG_SPEAR
Crash your game due to them spawning without AI.
194: CHAR_ANA_SPELUNKY
197: CHAR_ROFFY_D_SLOTH
201: CHAR_LISE_SYSTEM
207: CHAR_AU
200: CHAR_AMAZON
202: CHAR_COCO_VON_DIAMONDS
208: CHAR_DEMI_VON_DIAMONDS
210: CHAR_PRINCESS_AIRYN
209: CHAR_PILOT
213: CHAR_CLASSIC_GUY
211: CHAR_DIRK_YAMAOKA
215: CHAR_HIREDHAND
216: CHAR_EGGPLANT_CHILD
212: CHAR_GUY_SPELUNKY
205: CHAR_TINA_FLAN
204: CHAR_OTAKU
206: CHAR_VALERIE_CRUMP
203: CHAR_MANFRED_TUNNEL
199: CHAR_GREEN_GIRL
196: CHAR_COLIN_NORTHWARD
195: CHAR_MARGARET_TUNNEL
198: CHAR_BANDA
Instantly break.
51: FLOOR_TREE_TRUNK
52: FLOOR_TREE_TOP
54: FLOOR_TREE_BRANCH
56: FLOOR_MUSHROOM_TRUNK
57: FLOOR_MUSHROOM_TOP
58: FLOOR_MUSHROOM_HAT_PLATFORM
These crash your game.
285: MONS_GIANTFROG
236: MONS_WITCHDOCTOR_SKULL
293: MONS_HUNDUN_BIRDHEAD
294: MONS_HUNDUN_SNAKEHEAD
These just float in place.
255: MONS_APEP_BODY
256: MONS_APEP_TAIL
These just instantly disappear.
258: MONS_OSIRIS_HAND
78: FLOOR_PIPE
50: FLOOR_STORAGE
81: FLOOR_MOTHER_STATUE
84: FLOOR_TELEPORTINGBORDER
85: FLOOR_FORCEFIELD
86: FLOOR_DICE_FORCEFIELD
87: FLOOR_CHALLENGE_ENTRANCE
88: FLOOR_CHALLENGE_WAITROOM
Note: Most entities that start with DECORATION_ instantly disappear. A lot of entities starting with FX_ will crash your game.