Q&A for How to Complete the Pacifist Run in Undertale

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

Community Answer

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

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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!

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Question

How do I spare Muffet?

Community Answer

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

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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.

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Question

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

Community Answer

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.

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Question

Where do I see Gaster?

Community Answer

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.

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Question

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

Community Answer

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

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Question

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

Mapley

Community Answer

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

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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.

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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.

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Question

I didn't get the phone call. Any advice?

AtuaPraise

Community Answer

You have to complete the neutral run route by battling Asgore and Omega Flowey, otherwise the Pacisist Run won't be triggered.

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Question

I thought that you only had to just spare everyone and follow the story. Are you sure?

AtuaPraise

Community Answer

You also have to befriend Papyrus, Undyne and Alphys by completing their dating events. You also have to complete the True Lab storyline.

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Question

What if I don't want to do a True Reset?

AtuaPraise

Community Answer

There isn't really any way to retain everyone's memories if you complete the pacifist run. You have to do the true reset. If you want to do another run.

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Question

What happens if I kill Flowey on my first run?

Community Answer

Unfortunately you'll have to start over. A pacifist run means no killing at any point, not even the minor characters.

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Question

Why can't you do a Pacifist run before a neutral run?

MadeInHeaven

Community Answer

You can do the Pacifist run as your first run, but you must first complete the neutral ending as a prerequisite to the true Pacifist ending, before reloading the game.

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