A historic, revolutionary RPG masterpiece. Undertale completely redefines the role of violence in roleplaying games, combining wittily written characters and a legendary score by Toby Fox with interactive bullet-hell defense and a story that remembers your choices across save files.

Undertale is a groundbreaking, highly reactive 2D RPG that completely subverts traditional combat by allowing players to complete the entire campaign without killing a single monster. Falling into the Underground populated by monsters, turn-based combat is split into two halves: on your turn, you can choose to attack, use items, or utilize 'ACT' commands to interact with monsters systemically—such as petting a dog, telling jokes to a skeleton, or comforting a ghost. Once satisfied, players can use 'SPARE' to end the battle peacefully. On the enemy's turn, gameplay transitions to a highly creative bullet hell minigame where players navigate a small heart icon ('SOUL') to dodge bullet patterns matching the monster's thematic personality. The game features unparalleled narrative reactivity: the script, dialogue, bosses, and endings dynamically rewrite themselves based on who and how many monsters you choose to kill, tracking your actions permanently across save file resets.