The sound comes from Squid Game, the South Korean survival drama that became a global hit after its release on Netflix in 2021. In its opening game, a giant doll recites the playground chant while players must move only on green light and freeze on red light, with elimination for anyone caught moving. The German-dubbed version, Rotes Licht, Grünes Licht, spread through clips, edits and short-form videos, where the doll's voice became shorthand for the show itself. It remains popular because the game is instantly understood without explanation.