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Undertale Yellow has three main endings: Neutral, Pacifist (which can branch into True Pacifist or Flawed Pacifist) and Genocide.
This ending occurs when Clover kills some monsters or robots.
The Neutral Route ends with Clover facing off against Flowey at the UG Apartments but ultimately results in him resetting the player's SAVE.
This ending occurs if Clover does not kill a single monster or robot.
The Pacifist Route's final boss is Ceroba Ketsukane . Choosing to spare her or kill her results in the True Pacifist or Flawed Pacifist ending, respectively.
This ending occurs when at least 20 enemies are killed in each of the major area ( Dark Ruins , Snowdin , Dunes , Steamworks ) so that the encounters are replaced with the message " But nobody came. ". All bosses and minibosses generally must be killed as well, though some can be skipped or spared without aborting the route.
The Genocide Route's final boss is Martlet and ends with Clover escaping the Underground through the Barrier with the SOULs of the five humans .