This sound comes from Undertale, the 2015 indie RPG created by Toby Fox. The save point chime became memorable because players hear it repeatedly during key moments of exploration and relief. Online, it spread through gameplay videos, fangame content, speedrun clips and nostalgic edits, where creators use it as a quick audio shorthand for saving progress or reaching a safe point. It still shows up often because Undertale remains widely recognized and its sound design is instantly identifiable to many players.