"If you're not careful and no-clip out of reality in wrong areas, you'll end up in the Backrooms, where it's nothing but the stink of moist carpet, the madness of mono-yellow, and endless background noise of fluorescent lights at maximum hum-buzz, and approximately six hundred million square miles of randomly segmented empty rooms to be trapped in.
God save you if hear something wandering around nearby, because it sure as hell has heard you…"

Anomalous Levels are mysterious in nature — they cannot be fully described with an arbitrary number. Their lack of definite discovery dates makes it extremely difficult for us to firmly label with a specific number. Therefore, they are referred to by symbols, exaggerated numerical values, or their most distinguishing feature. While not necessarily more dangerous, these places generally ignore the rules of normal levels in the Backrooms, sometimes feeling like otherworldly dimensions rather than liminal spaces. You have been warned — many of these places will break your sense of reality.

The Negative Levels are areas that were discovered below Level 0 and are very dangerous. These Levels go very far. It is suggested that you should bring some equipment to explore these Levels.

Hey, if you're interested in any of these levels, you can always go to the wiki and read it for yourself to find out more about it!
Fandom Wiki https://backrooms.fandom.com/wiki/Bac...
Negative levels pages https://backrooms.fandom.com/wiki/Lev...

Every Level    • Video  
Every Secret Level    • (OUTDATED) Every secret level of The ...  
Every Entity    • (OUTDATED) Every entity of The Backrooms  
Every Sub-Level and Room    • Every Sub-Level and Room of The Backr...  
Every Object    • Every object of The Backrooms  
Every Joke Level and Entity    • Every Joke Level and Entity of The Ba...  
Liminal Archives    • Every Limspace of The Backrooms & oth...  

Music used:
"Misplaced in Time" - by The Caretaker    • Misplaced in Time - The Caretaker (St...  
"Drive" - by Dreamcorp    • drive  
"World's Smallest Violin" (Slowed down at x0.8)    • Video  
Sailor Moon OST "A Girls Feelings" (Party Effect Remix by REDPRISMFX)    • Video  

DISCLAIMER: Every image showed in the video comes from the Backrooms Fandom Wiki (almost all of them).
All of them belongs to their respective owners
Some images were edited by the level's autors