Level 1 (The Warehouse): This level contains more hazardous creatures and dark, industrial places. Managing the Backrooms surroundings while staying safe could be the difficult part of this situation.
Level 2 (The Maintenance Tunnels): A more gloomy, cramped setting with more hostile beings and dangerous passageways.
Level 3 and Upward: The difficulties get harder as players advance, with increasingly intricate creatures, riskier settings, and fewer resources.