How to Unlock the Genocide Ending in Undertale

This guide will show you how to obtain the genocide ending for Undertale.


The Genocide Route leads to the darkest ending in the game. It consists of you killing every possible monster in the Underground.

This route’s ending can occur without prior completion of the game. Once you complete a Genocide Route, subsequent True Pacifist Route endings are altered – even after a True Reset.

The Genocide Route occurs when you kill every enemy in every region: the Ruins, Snowdin Forest, Waterfall, and Hotland/The CORE.

Starting in the Ruins, continuously trigger encounters and kill monsters until encounters with monsters no longer occur. After killing all monsters in an area, encounters still occur, but monsters do not appear. In a font size smaller than usual, the battle text reads “But nobody came.”, which can also occur in a Neutral Route when you kill all monsters in an area.

If you stop meeting the requirements for a Genocide Route at any point, it will revert to a Neutral Route where the unaltered soundtrack plays. NPCs still occur in the region where you abandoned a Genocide Route.


Exhaust the random monster kill counter in every region. This requirement must be done before approaching the final encounter of that area.

You can spare any number of random encounters (Snowdrake is an exception, as seen below). Sparing certain monsters allows you to avoid fighting particular monsters such as the high-defense Jerry. You can also spare certain monsters so that you can kill monsters that offer more EXP and GOLD, such as Glyde.

The following is a list of the number of random encounters only that you must kill as stated at SAVE points in red text, followed by the final boss of the area.

Ruins: 20 kills (Toriel)

Snowdin: 16 kills (Papyrus)

Waterfall: 18 kills (Undyne the Undying)

Hotland/CORE: 40 kills (Mettaton NEO)

New Home: No kills (Sans)

You automatically kill Asgore upon encountering him, while Flowey is killed when any of the action buttons are pressed.

Snowdrake is unique in that he must be killed before the kill counter is exhausted and is also part of the kill counter.

Once you satisfiy the kill requirement, SAVE points display the message “Determination.”

Kill every boss and miniboss. All mini-bosses (excluding Snowdrake and including Shyren) can be encountered even after the kill counter is exhausted, which can be used to obtain extra EXP.

  • Toriel
  • Snow-drake
  • Doggo
  • Lesser Dog (random but mandatory encounter)
  • Dogi
  • Greater Dog
  • Papyrus
  • Shyren
  • Glad Dummy
  • Undyne the Undying (triggered by fighting Monster Kid)
  • Royal Guards
  • Muffet
  • Mettaton NEO

Kill counters for different areas have different requirements. If certain events are triggered before clearing an area completely of monsters, you are automatically sent back to a Neutral Route. For example, if Papyrus’s battle is initiated without exhausting the Snowdin kill counter, the cutscene proceeds as if on the Neutral Route. Even if you are captured and then go back to finish off the last monsters, re-fighting Papyrus still proceeds as on the Neutral Route. Once a Genocide Route is aborted, it cannot be returned to without reloading to a SAVE before it was aborted or resetting entirely.

Erasing the World

Erasing The World

Instead of leaving the black screen and returning to the Throne Room, Chara appears on the black screen. They begin speaking to you directly.

Chara explains that your determination was the reason that the former came back, and that you taught Chara the reason for their return, power, and gave them the means to gain it. They then offer to destroy the world so that the two of you can move on to another world. At this point, two prompts are given: “ERASE” or “DO NOT.”

(During this conversation, you cannot exit the game with the ESC button. You can only exit using your computer’s Task Manager.)

If you choose “ERASE”: Chara calls you “a great partner” followed by the world’s destruction.

If you choose “DO NOT”: Chara will be confused and disappointed at your refusal which then results in a jumpscare as they erase the world anyway.A large slash animation strikes the screen and is filled with “9’s,” resulting in the world’s destruction, and the game closes. (If you are on PC/Mac)

Restoring the World

Upon relaunching the game, only a black screen with howling wind appears, as inputs do nothing. You must wait 10 minutes for Chara to talk to you, while on console versions, you must wait only 30 seconds.

Chara reminds you that you destroyed the world and then questions if the you think you’re above consequences. They then suggest that you could compromise and that they will bring back the world in exchange for your SOUL.

If you agree to this exchange, the game closes and appears to load normally the next time it is opened, while the console versions immediately reset.

Declining the offer will result in a black screen forever. However, if you restart the game, Chara will reappear again after ten more minutes to offer the deal again.

Once the offer is accepted, the game closes. When re-opened, the game functions as if you just installed the game, as a naming prompt is given. All future True Pacifist and Genocide endings are altered.

Soulless Pacifist Ending

After completing a True Pacifist Run after a Genocide Run, if you choose “I wish to stay with you” while on the surface with Toriel, within four seconds after she leaves the bedroom, Frisk would turn in the bed to face the screen, only to reveal Chara’s face with red eyes. A low-pitched version of Flowey’s laugh plays, and the screen cuts to black.

If you choose “I have places to go” when Toriel asks: the picture in the credits shows all of the characters’ faces crossed out, and Frisk is replaced with Chara’s sprite.

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