Steam
Backrooms Project: The lost file
Also known as Backrooms Project: The lost file, backrooms project lost file, backrooms-project-the-lost-file
Backrooms Project: The Lost File - it's a horror exploration game, with many puzzles
Last update
1 Jun 2026
Players now
0
Latest update
Update history
Browse past updates and patch notes for this game.
6 updates
Gallery
In-game media
Achievements
Community progression
Top picks from 15 Steam achievements, sorted by player unlock rates.
- THE LOBBYWelcome to level 095.0%
- FlashlightNow you can illuminate any area81.4%
- PistolYou found a pistol30.8%
- Run for your life!Hidden29.6%
- Hidden RoomHidden22.2%
- Cursed TorchHidden22.2%