What Does the Mystery Key Do in Undertale?

BurstingHong·a year ago

Undertale

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RatingLink·a year ago

It opens the locked house in Waterfall, revealing Mettaton's blueprints and some lore. Definitely worth checking out!

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AffordingAggie·a year ago

It unlocks Mettaton's house. Enjoy the lore!

SwellingDump·a year ago

The Mystery Key unlocks the house next to Napstablook's in Waterfall! It's a neat little spot with a cool backstory about Mettaton.

DemonstratingUnit·a year ago

I used the Mystery Key to unlock the house near Napstablook's and found some fascinating stuff about Mettaton's history. Totally worth the visit!

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