Undertale is the indie role-playing game created by Toby Fox and released in 2015, known for its characters, humour and player choices that shape the story. Its healing sound became familiar to players who spent long stretches exploring the Underground, restoring health between battles and boss fights. As gameplay clips, edits and streams spread online, the short chime travelled beyond the game itself and became shorthand for recovery and relief. It remains popular because it is instantly recognisable to fans and carries a calm, positive feeling.