Level 0 is treated as the starting point of the Backrooms mythos. Its origin is a single photograph of yellow wallpaper posted to 4chan in 2019, and the lore holds that anyone who "noclips" out of reality slips into this place. Monotonous yellow walls, perpetually damp carpet, and fluorescent lights that hum without ever switching off repeat without end.
The horror here lies not in a monster but in the architecture itself: the claustrophobic sense that every room is vaguely familiar yet none has an exit, and the absence of any people despite the traces of habitation. It is a case of one record swelling into a vast place — a clean illustration of the Backrooms logic in which what is seen becomes what is there.