Undertale is an indie role-playing game created by Toby Fox and released in 2015, known for its bullet-hell battle system centred on a small heart-shaped soul. That soul represents the player's essence and moves to dodge attacks during encounters. Short interface and battle cues like this one became widely shared among fans through gameplay clips, fan animations and soundboards. As Undertale's community kept creating remixes and memes long after release, its distinctive sounds remained shorthand for determination, damage and classic indie game nostalgia online.