What Does Mystery Key Do in Undertale?

VitriolingMouth·a year ago

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WarningSquad·a year ago

The Mystery Key unlocks the house next to Napstablook's in Waterfall. Inside, you'll find a lot of unique lore about Mettaton!

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CarryingTree·a year ago

Really, it's just for some neat background info and a bit of fun exploration. Don't expect epic loot or anything.

WanderingFacet·a year ago

It opens Mettaton's house, giving you some extra bits of the story. Totally worth using if you're into the lore and backstories.

RemovingMyth·a year ago

You use the Mystery Key to open the house to the right of Napstablook’s house in Waterfall. You’ll learn cool stuff about Mettaton!

👀 If you like Undertale...

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