Crab Game is a free multiplayer game released in 2021 and inspired by the survival drama Squid Game, with Red Light Green Light as one of its best-known modes. Players must advance only while the light is green and freeze when it turns red, a simple rule that made the mode easy to watch and clip. Gameplay videos, streams and short-form edits spread the green light cue beyond the game itself, turning it into shorthand for a sudden chance to move. It remains popular because that clear go signal works instantly, even for viewers who have never played Crab Game.