Level 0

Level 0 is the level that most people enter and exit through. Level 0 is mostly just walls with yellow wallpaper yellow somewhat brown moist floors annoying fluorescent lights and probably more then 50 million arches of randomly segmented rooms. There are outlets on the walls but they don't do anything. There aren't many entities here besides rippers and deathmoth nests yet it is a very rare to come across one of these creatures in level 0 and even if you do they are easy to outrun and kill.

here a list of colonies set up in level 0

agency outpost 0
This is a colony set up by the agency the agents at this outpost help people who are confused or lost in level 0 open to trade and can kill entities pretty easily contains 20 agents and 0 travelers (besides those passing by).

yellow madness
This colony is very friendly open to trade and offers to help people they are probably the largest colony in level 0

10 agents 75 travelers

the pyros
this is the 3rd and possibly last colony in level 0 these guys are open to trade but for some reason seem to attack agents they get their name because they light both agents and entities on fire with lighters, flamethrowers,ect

0 agents 13 travelers

Now how to escape level 0

You can escape level 0 by finding a door that says exit above it if the exit sign is green it will lead back to earth

Red exit signs lead to level 1 2 or 4

blue exit signs (the most rare ones) lead to worse places then the backrooms