Entrances: If you found a red rock in the Level 1840 you got a noclip to the Level -1840. If you found a red desert in the Frontrooms you it's nocliped to the Level 1840, and the final entrance is when you found a small amount of water on the Level 46.

Exits: There's just one exit, if you found a lake of liquid pain, just jump in this lake, because it's the only way out, but it's rare that you teleport to the last level of the backrooms, the Level 9223372036854775807...

Colonies: The martians, it's the one of the oldest groups from the Backrooms, but it's extinct, and theres the DZ, it's best can't say about...

Entities: Lights are the only entities in the level that are much more dangerous than a third of the entities in level 5

The lights are creatures that if you follow them, goodbye to you

Level -1840 it's the first level discovered with Class 6!

Thanks to see my new Custom Level from the Backrooms!