For centuries, monsters have been kept isolated from humans by a powerful spell, in a dark, subterranean world beneath a great mountain.
This nearly impenetrable barrier can only be broken by the combined use of the souls of seven very special human lives.
Play as a young child named Clover, who ventured onto the dangerous Mount Abbott and fell into the Underworld, the realm of monsters.
Your life is precious to humanity because you carry the Yellow Soul, the soul of justice...
Undertale Yellow is a prequel to Undertale, created by a huge fan of the original game.
It's a role-playing game that uses the same mechanics as Undertale: turn-based combat, peaceful or violent conflict resolution, and numerous puzzles to solve.
See also:
Undertale Enchanted