Danger level: Hostile
Description: Level 21 consisted of 4 segmented corridors that each contained 80-120 doors on both sides with a separating wall that stretches 2.5 meters in length. The corridors will change every 60 - 90 minutes and lights can go off which can result in an entity infestation to take place. This level is extremely dangerous considering of so many hostile entities in here, one can occasionally find a resting place or a door that leads to another corridor.
Colonies and outposts: None
Entities: Entity number present from 1 - 20
Enterances and exits:
there is no way to escapeEscape by going through a door from number 1 - 800