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Level NaN is the ???????th level of the Backrooms.

CUIcon.png

Survival Difficulty: Class Undetermined
》Mysterious Properties
》Unknown Information
》Undocumented Entities

Level NaN: "Reality?"

A tram passing by in Level NaN (supposedly).

Level NaN is a "level" of the Backrooms that may not even exist. It's a perfect replica of The Frontrooms, except when you enter it, nobody notices you. You can't interact with anything, people simply phase through you, and any noise you make won't be heard. This level can supposedly be entered via Level 39999.

Attempting to Re-enter the Backrooms

If you find a discolored wall or try to noclip, it's currently unknown what happens. It's theorized that you get sent to either the actual Backrooms, an alternate version where no entity can see you, or simply The Void.

"The exits are fake"

In Level 39991, in the 'Backrooms' section you can find a book called "The Error Log", the book itself details various anomalies found throughout the Backrooms, but the interesting part is the 6th chapter, "????". This chapter contains every possible sequences of B's and R's (of length 20), with "BR" likely being an acronym for "Backrooms". However, there are a few sequences containing incorrect letters. Putting these incorrect letters together spells out the messages "The exits are fake", and "Trying to leave results in". So, perhaps "The exits are fake" means that every exit to reality (not just Level 39999) is fake and simply leads you here. It's also worth noting that the letters that spell out "fake" are all found in the 3999th sequence of B's and R's, with Level 3999 being the most well-known exit to reality.

As for the second message, it's unclear what this is referring to, since it's cut off, although it's most likely just repeating the point that none of the exits are real and that they all just send you to Level NaN. But again, it's still unknown whether or not this level (or dimension) even exists, as there are only a few reports of people ending up here.

Colonies and Outposts

Due to the nature of this level, these most likely can't be established here.

Entrances and Exits (all unconfirmed)

Entrances

  • Jump through the hole in the ground in Level 39999.

Exits

  • No-clip to possibly enter:
    • The Void
    • The Backrooms (likely Level 0, 1 or 2)
    • An alternate version of the Backrooms with similar properties to this level.
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