Sour Music Kart is a racing modification (Mod) released in 2017 for the Super Nintendo Entertainment System. As a mod, it alters the core framework of its parent game, focusing on competitive circuit racing using power-ups. Its unique appeal stems entirely from the specific content changes—such as track design or item behavior—implemented by the developer, Sour Music, offering a distinct, community-driven take on the classic 16-bit racing experience.