The Backrooms are an extradimensional space containing impossibly large expanses of empty rooms accessed by "no-clipping out of reality" in certain areas. There are different kind of Backrooms, called "levels", each containing different entities, some are hostile. Level 0: "The Lobby. Level 1: "Habitable Zone". Level 2: "Pipe Dreams". Level 3: "Electrical Station". Level 4: "Abandoned Office". Level 5: "Terror Hotel". Entities such as Partygoer, Smilers, Hound, Howler, Skin-Stealers.