How to Beat the Spider Boss in Undertale Pacifist
To beat Muffet in a Pacifist run, make sure to buy a Spider Donut or Spider Cider from the Ruins and use it during the battle. She’ll let you go right away!
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Simple trick: Use a Spider Donut or Spider Cider you bought in the Ruins. Muffet will recognize it and end the fight.
I remembered I had a Spider Cider from the Ruins when I faced Muffet. Using it made her call off the fight immediately. Saved my bacon!
No need to stress! If you brought the Spider Donut from the Ruins, show it to Muffet and she'll let you go!
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