Endings

Undertale has three distinct endings. There are many slightly differing neutral endings depending on the choices the player has made throughout the game.

Neutral Route
A Neutral ending occurs when the player does not befriend at least one plot pivotal character (Papyrus, Undyne or Alphys), and does not start the Genocide Route by killing every enemy and boss in each region.

A neutral run ends with the player escaping the Underground alone. There are a variety of different possible endings depending on the actions you have taken throughout the game. These endings are detailed on the Neutral Route page.

True Pacifist Route
This ending requires the player to kill no enemies throughout the game. Additionally, the player must befriend Papyrus, Undyne, and Alphys. The player cannot gain any EXP (meaning also that they cannot progress past LV 1.)

If you play the direct route, you will be prompted with option to stay or leave. If you choose to stay, an ending will show a extra cutscene of Toriel placing a slice of pie on the floor of the player's room, and if not a group photo will be shown instead.



Genocide Route
A Genocide run requires the player to kill all enemies in each area (Ruins, Snowdin Forest, Waterfall, Hotland/Core). This includes killing all of the bosses. The player is warned several times by Sans that they will have a "bad time" if they continue in this direction.

Completing a Genocide run leads to a bad time; the first human destroys the game's world. The first human asks the player to give their soul to them in exchange for the world to be remade (making the game playable again), and doing this irrevocably alters the true pacifist ending. However, it is possible to remove this alteration by editing the game's files.

Post-Genocide True Pacifist
After having finished a Genocide Run, if the player sells their soul then they are able to play the game. However, if they complete the game on the true pacifist route then there will be a modified epilogue with the protagonist possessed by the first human.

If the player chooses to stay with Toriel, the cutscene continues after Toriel closes the door; the protagonist turns to your direction with open red eyes and rosy cheeks, followed by a demonic laugh (like Flowey's, but slower) as the screen goes black.

Alternatively, if you choose the second option to 'have places to go', will show the group photo with the protagonist replaced by the first human and with everyone's head except the first human's crossed out in red.