Behind the Backrooms is a Co-op online horror game up to 4 players, where you and your friends will fight to escape from the different levels of the backrooms. Co-op Multiplayer Explore the backrooms with a team of up to 4 players to solve puzzles. Levels Traverse unique levels based on backrooms lore with regular content updates adding more. Sub Levels The entrance is hidden in a normal level. Negative Levels The entrance is hidden in a Sub level.