Portal 2 is Valve's first-person puzzle game, released in 2011, in which players solve test chambers built by the artificial intelligence GLaDOS. Its sharp failure cues, including this buzzer, became instantly recognisable to players who heard them repeatedly while learning the game's puzzles. As gameplay clips, fail compilations and reaction edits spread online, the sound moved beyond the game itself and became a quick shorthand for being wrong. It remains popular because the meaning is immediate, even for viewers who have never played Portal 2.