If you see a purple glitched wall in level 11, that's your ticket to level 3999. Then walk until you see glass doors. Go through those and most of the time, you will come back to reality. Otherwise, you end up in level ♾️
Noclip anywhere aside from level 6, and you could black out and wake up in level sol in a random spacecraft. You will gain the knowledge of how to pilot the craft whilst in the level
Ok. Good luck. If you ever need to go to another safe haven, level sol is one of the easier places to get to. Doors to the level may be disguised as entrance doors. They are pretty common.