Level 0 is simple. It has wet, soggy, carpet as flooring, obnoxiously loud fluorescent lights, ceiling tiles, and a yellow hue to all of it. Interactions with other beings are extremely rare, but can happen. If you do make eye contact, look away from it immediately.
Level 1 resembles a sprawling warehouse, with boxes that can have some useful items for survival. Level 1 also has puddles that are safe for consumption. In level 1, the lights can flicker and turn off for minutes or even hours at a time. When this occurs, this level becomes more dangerous as entities will start to appear.
Level 2 resembles a maintenance tunnel that twists and turns in all directions. The hallways have pipes aligned on the walls, and this level contains many entities. The entities here, are also very violent.
Level 3 resembles an electrical station with orange bricks as walls, and dusty concrete as floor and ceiling. This level contains even more entities than level 2. This level contains many supplies on the floors of this level.
The abandoned empty office. It's a very safe level, due to a small number of entities. And also this level is the main source of almond water. For this reason, there are more chances to meet another person or even a colony.
This level is an infinite hotel from the 20th century. There are some entities are wandering around some rooms of this level. However, this level is famous for its mental effect on wanderers. Some people can feel that someone is watching or even touching them, but when they turn back they can’t see anyone.