The game is known for its turn-based combat with bullet-hell dodging mechanics, where you can choose to FIGHT, ACT, use an ITEM, or show MERCY to the monsters you encounter. This flexibility allows players to complete the game without ever killing a single creature—a pacifist approach that leads to different story endings.

Buy the full, authorized version of the game via digital storefronts such as Steam, PlayStation, Nintendo eShop, or Xbox.

Beyond full fan games, the Undertale modding community is incredibly active. Mods can change gameplay mechanics, rewrite dialogue, introduce new characters, or create entirely new storylines. Some popular mods include:

Welcome to QuackPrep's Undertale full playthrough! In this video, QuackPrep will guide you through the entire story of Undertale, a critically acclaimed role-playing game developed by Toby Fox.