Undertale is a role playing game created by Toby Fox and released in 2015, known for its bullet hell combat and choices about mercy or fighting. When the player character dies, their red heart shaped soul cracks and shatters on the game over screen, accompanied by a sharp breaking sound. Fans have shared reversed versions of that effect online, flipping the break so it sounds like the soul reforming. The variant remains popular in fan games, animations and edits that reference death, determination and restarting after failure.