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Undertale has three different main endings (Neutral, True Pacifist, and Genocide) and a fourth miscellaneous ending (Hard Mode).

Neutral Route

For more detailed explanations of this route, see Neutral Route.
This ending occurs when one of these conditions are met:

The Neutral Route ends with the protagonist escaping the Underground alone. There are a variety of different possible variations of this ending depending on the choices made throughout the game.

True Pacifist Route

For a more detailed explanation of this route, see True Pacifist Route.
This ending occurs when all of these conditions are met:

  • A Neutral Route has been completed. (A reset is not required, only reloading the player's SAVE file afterwards.)
  • No monsters were killed throughout the game. (The protagonist cannot gain any EXP, and as a result, they cannot progress past LV 1.)
  • Papyrus, Undyne, and Alphys have been befriended.
  • The True Lab has been explored.

The True Pacifist Route ends with the barrier being broken, and the protagonist and the monsters of the Underground being able to leave. Additionally, this route features the True Pacifist Ending Credits.

Genocide Route

For a more detailed explanation of this route, see Genocide Route.
This ending occurs only when all enemies in each area (Ruins, Snowdin Forest, Waterfall, Hotland/CORE) are killed until no one remains. This includes all bosses.

Completing the Genocide Route leads to the destruction of the game's world. Upon re-launching the game after a completed Genocide Route, the first human asks the protagonist to give up their SOUL to them in exchange for the recreation of the world. This effectively acts in the same way as a True Reset from the True Pacifist Route, but it also permanently alters the endings of any later Genocide or True Pacifist endings (Soulless Genocide & Soulless Pacifist). Neutral endings after a Genocide Route are unaffected.

Hard Mode

For a more detailed explanation of this route, see Hard Mode.
This mode is activated when naming the first human "Frisk". It is a difficulty enhancing mode that consists of slight dialogue changes and more difficult monster encounters (with some exclusive to this mode, while others can be found in the CORE). Hard Mode only lasts until the end of the Ruins, similarly to the Undertale Demo. After defeating Toriel, the Annoying Dog arrives to announce the end of Hard Mode.

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