Level # is a 3D program that lags frequently and inconsistently; lagging can last for a quarter of a second or for over 30. During delays caused by lag, wanderers can still give the body inputs to move, but the movements happen rapidly when the delay is over. Essential functions like breathing and heart beating are part of these movements, causing the level to be fatal.
The level consists of 3D shapes that sometimes move. These shapes can randomly no-clip into wanderers, causing them to suffocate if they're stuck long enough.
Level #’s Theories
Level # is not proven to be a simulation. Some people believe the level is a simulation while others believe the level is only made to look like a simulation, and that the 3D shapes are living beings. Level # is also believed to be infinite in size with infinite 3D shapes. If the level is a simulation, this theory may explain the lagging.