Floor 285: The Impossible (and infinite) Maze
This floor contains nothing, only an empty room. The only thing here is an impossible structure: a mysterious door on a wall in the middle of the room, and it leads to a corridor that's bigger on the inside. The corridor leads to a staircase going both ways. Going downstairs leads to a shrinking machine. Once you are shrunken by this machine, you can go inside another impossible door. Apart from the fact that it's bigger on the inside, the walls of itself isn't visible on the outside, and the door is actually a portal bringing you to a bigger area, thus making you go back to normal size. Going upstairs leads to a bridge, suspended high above the floor of a really big room. Afterwards, there's yet another staircase. It only goes up this time. When you go up the stairs, you are brought to the exact same bridge in the exact same room with the exact same entrance. But that's only the beginning; it's infinite, and attempting to backtrack is impossible, as the maze keeps shifting and changing as you walk through it. This is the only discovered and reported on part of the maze. Many people have walked into the maze, and never came out.