The Backrooms (LEVEL 5)

If you're not careful and you noclip out of reality in the wrong areas, you'll end up in the Backrooms, where it's nothing but the stink of old carpet, the madness of the mono-yellow, the endless background noise of the fluorescent lights at maximum buzz, and approximately million square miles of randomly segmented empty rooms to be trapped in, God save you if you hear something wandering around nearby because it sure as heck has heard you.