Dig Dug was released by Namco in Japanese arcades in 1982, with music by Yuriko Keino, and became one of the defining maze games of the era. Players dig tunnels underground and defeat enemies by inflating them or dropping rocks. The track catalogued as Time Out Warning became the game's hurry-up signal, a faster, more urgent version of its playful theme. As retro arcade sounds were shared on emulators, videos and soundboards, this cue survived as a shorthand for time running out in games and edits.