Level 11

Level 11 is the 12th level of the Backrooms. It is unknown who first discovered it, but u/Ilikebacon999 was the first to describe it on the subreddit.

Description
Level 11 is essentially a tightrope maze. It consists of wide tightropes that connect various rooms together. These rooms are similar in appearance to Level 0, and have wireless charging ports in the center.

Outside of the rooms lies a blue void. If you fall into this void, you return to where you entered the level. The data signal also happens to be very strong, but you will be teleported to where you started if you call a number outside the backrooms.

Level 11 has many ways of access. One way is by playing the elevator game on some of Level 5's elevators. Another, described in a note that u/Ilikebacon999 found lying around, is to find a blue room on Level 9 and go through the door in said room.

Exits
It's rumored that about 100-200 miles behind a room with a non-functioning elevator, you can find a door to the blue room described in the note.