R.E.P.O. is a co-operative horror game in which small teams enter haunted locations, grab valuables and try to extract them while monsters patrol the rooms. The boombox is one of the game's lighter tools, giving players a piece of music to carry through that tension, and clips of it spread through gameplay videos and streams as the game found a large online audience. It remains popular because it instantly signals R.E.P.O. to viewers, turning an otherwise stressful run into something funny and shareable without needing any explanation.