The Backrooms The Backrooms is a mysterious dimension one accidentally falls into when a "No-clip" phenomenon occurs in reality. It consists of countless levels including endless rooms, hallways, warehouses, factories, and underground spaces, with each level having a different structure, environment, and hazard. Most levels have hard-to-find exits, and food and water are very scarce. Entities that attack or hunt humans roam everywhere, posing a constant threat to life. While safe zones exist in the Backrooms, most are extremely dangerous, and it is known to be almost impossible to return to reality once you enter.

Level 1 (Habitable Zone) Level 1 is often one of the first levels reached in the Backrooms and consists of a massive warehouse-like space. Concrete walls and floors, high ceilings, numerous pipes and wires, rusted steel shelves, and wooden crates continue endlessly. Some areas are lit by dim fluorescent lights, but many places are submerged in complete darkness due to power outages. Special caution is required as entities frequently appear in these dark zones. In Level 1, items necessary for survival such as water, food, tools, batteries, and Almond Water are occasionally found, but there is also a high possibility of encountering dangerous entities while searching for supplies. The structure is complex and similar passages repeat, making it easy to get lost, and the sound of machinery operating or metal clashing can be heard from a distance. Notably, Smilers, Dullers, Skin-Stealers, and Clumps are known to appear. One must always be alert to their surroundings, especially in dark passages or wide warehouse areas, and avoiding unnecessary noise is helpful for survival. Level 1 is easier to obtain supplies from than Level 0, but it is the first survival test of the Backrooms where that much more danger lurks.