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Entities are the main roadblocks that players must face in order to advance. They all differ in mechanics and difficulty, along with some being encountered more rarely than others. Certain audio cues or visual imagery can warn you before an entity spawns in.

Lifts (Nitrome Must Die), Nitrome Wiki

Vs. Rush: A 1up Cartoon's Doors Song, Funkipedia Mods Wiki

Moon (Nintendo DS Game), Nintendo DS Wiki

List of Entities, DOORS Wiki

Office, Five Nights At Freddy's Wiki

Desolate Hospital, Yume 2kki Wiki

Thoughts? : r/ARK

Snare, DOORS Wiki

Melted Impure Mouse, Five Nights at Treasure Island RP Wiki