How To Get Pacifist Ending Undertale

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Undertale is a popular indie RPG that was created by Toby Fox in 2015. This wikiHow will show you how to achieve the Pacifist ending for the game. You must finish a Neutral Run before you attempt this method, otherwise, you will just complete a Neutral Run.

1

Don't attack a creature you enter a battle with. This excludes the training dummy at the very beginning of the Ruins but does include the first Froggit you encounter. You can attack, but you shouldn't do so, as it might kill them, botching a Pacifist Run.
2

Spare Toriel every round. At the end of the Ruins, you fight Toriel to escape. Do not attack her, just keep on Sparing her and avoiding her attacks.

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1

Don't attack any creatures. Same as the Ruins, but more difficult due to the more challenging mini-bosses.
2
Spare Papyrus. You can also Flirt and then Spare until the end of the battle. Just don't kill him. You can fight him until he uses the "Absolutely Normal Attack", which ends the battle faster since he always uses it one turn before death.
- If you're having trouble with this battle, make sure you understand blue attacks
3

Go on the date with Papyrus. Go to his house and he'll ask you something like: "Are you ready to start the date?" and choose yes. After your date, he'll give you his phone number.

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1

Don't kill any monsters.
2

Spare the Mad Dummy. This can be done by luring the attacks so that they injure him instead. However, when Mad Dummy starts using rocket attacks, you don't need to hurt him with them.
3

Go visit Napstablook's house. It is the house on the left next to the Snail Races. This step isn't necessary to complete the Pacifist Run, but he has a pretty cool house.
4

Make your way to Undyne's Cave. This can take a while due to her excessive spear attacks, but once you get there it'll pay off.
5

Spare Undyne . Then Flee when your heart turns red. During this, you'll have to fend off her spear attacks, but they are fairly easy to memorize.
6

Go up through the cave and keep Fleeing. After every battle, Undyne will become more and more tired. Just keep on fleeing after your heart turns red and run along the path to the Hotlands.
7

Save Undyne when you reach the Hotlands. She will collapse on the ground because of her too-hot armor. After that, go to the water cooler and grab a glass of water, then pour it on Undyne's head.
8

Become friends with Undyne. You do this by walking all the way back to Waterfall and entering the house in the entrance right of Napstablook's. Papyrus will be waiting to "introduce" you to Undyne. After that, it's pretty straightforward.

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1

Don't kill any monsters. You'd be surprised at how many people forget.
2

Go through Alphys' Lab. When you enter the Hotlands you'll notice a large, white building on the right of the screen, which you should enter. Mettaton's quiz is very easy; Alphys will give you all the answers. If she doesn't, then that means any answer will qualify. However, even if you get every question wrong, you won't die.
3
Progress through assorted puzzles, games, etc. There are lots of puzzles and minigames made by Alphys and Mettaton that you have to go through to reach the CORE, but they are pretty self-explanatory.
- If you are having trouble with any of the puzzles, Alphys will usually give you a phone call explaining the rules and possible solutions to your current puzzle.
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1

Buy healing items at MTT Resort. After entering, looking at one of the trash cans can give you a healing item.
2

Wait in the room. Normally, two paths have to be completed to access the final part. However, you can skip both if you wait in the room with the forcefield until it disappears.
3
Fight Mettaton EX. Boost the ratings to 10,000, or if his limbs are still intact, 12,000 to win the fight.
- To boost your ratings, you can type certain words in the essay, eat foods from MTT Resort or the trash can from earlier, wear different armor that hasn't been equipped before in the battle (not the entire game, but single battle), and use certain ACTs.
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1

Don't do anything. However, if you haven't completed a Neutral Route before, you'll have to fight Asgore, and then Flowey.
2
Beat Asgore and Flowey. This will close the game, and after opening, a fake intro plays.
- Fight Flowey. It is actually much easier than it seems. After you get through his first few rounds of attacks, the souls of the other Fallen children will aid/heal you in defeating Flowey.
- Spare Flowey. Sparing him 13 times will earn you a hint on getting the Pacifist Ending after getting Sans' call.
- Again, if you have already completed a Neutral run, skip this step.
3

To beat Asgore, TALK to him 3 times, then FIGHT him. (Will not effect pacifist)

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1

Answer your phone. This time, you will probably get a call from Undyne. Afterward, backtrack to Papyrus' house.
2

Go to Alphys' Lab in the Hotlands.
3

Trigger the dating event with Alphys. After that, go to Alphys' Lab in the Hotlands again.
4

Go into the "bathroom". It is actually an elevator, that breaks and makes you fall to the True Lab.

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1

Spare all the amalgamates. Put all the keys in the holes. There are four keys scattered throughout the True Lab.
2

Get the Red Key. Spare Memoryhead.
3

Get the Yellow Key. Examine the bed in the center row and right column, in the bedroom. You can find this directly to the right of the elevator room.
4

Get the Blue Key. Spare Snowdrake's Mother.
5

Get the Green Key. Examine the shower curtain.

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1

Take the elevator. You'll go to New Home, and the elevator will be sealed by vines.
2

Go to the barrier. Trigger the Asgore fight.
3

Prepare for the final battle. Toriel will appear and launch Asgore with a fireball, followed by all the other main monsters. After a cutscene, you will be taken to the final battle.
4

Do anything on your turn during the first phase. Continuously use Struggle in the next phase.
5

Save your friends. After a cutscene, you need to SAVE all your friends by using any ACT at certain times.
6

Keep Saving Asriel until you can finish the battle.

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1

Backtrack to any area in the Underground. Talk with the NPC's with different dialogues.
2

End the game. Enter the door, where the barrier used to be. Then, you can perform a true reset which will erase everyone's memory. You can either start over or take a different path.

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Add New Question

Question

What will happen if I kill all the monsters except Papyrus and Sans?

You'll get one of the calls at the end of the game, declaring your results.
Question

What will happen if I'm out of money when I'm still trapped at Muffet's house?

Mateo Salazar

Community Answer

If you bought the spider doughnut in Ruins, you can just spare her. Or try eating one during the fight!
Question

How do I spare Muffet?

You have to continuously evade her attacks and avoid killing her. After several attacks, she will spare you.
Question

What if I kill Sans and no one else?

Squiddy McSquidface

Community Answer

You cannot kill him on a pacifist or neutral route. Sans can only be killed on the genocide route.
Question

What's the difference between the Pacifist ending and the True Pacifist ending? What about the Neutral ending?

The Neutral ending in UnderTale is when you do not kill everybody or it is your first run. On your first run, the only options are Genocide and Neutral, whether you spare everyone or not. There is no difference between Pacifist and True Pacifist.
Question

Where do I see Gaster?

When you start the game, you get a random number from 1 to 100. If your number is 66 (there are ways to change it to this), after you finish the game, go back to the waterfall. A corridor will be added with a gray door on the wall. Enter the room and you will see what is widely accepted to be Gaster.
Question

What if I kill any monsters at any time in pacifist?

Then you no longer have a pacifist run and have to either restart or revert to your last save.
Question

What is the hardest boss to spare in the Pacifist ending?

I would say the hardest boss to spare would be either Undyne or Ariel, as they are both very persistent.
Question

What happens if I do Pacifist after genocide?

AtuaPraise

Community Answer

I'm not going to spoil it, but you do get an Easter egg at the end, be prepared for tears.
Question

How do you change your FUN score?

AtuaPraise

Community Answer

Open file0 with Notepad. Change line 36 of the document to the desired number. Then open undertale.ini and change the number listed 'fun' to the same number.