Where to Use the Mystery Key in Undertale

avatarSingingRidge路3 months ago
Undertale
Best Answer
avatarBurstingHong路3 months ago

You use the Mystery Key to open the locked house in Waterfall, right by Napstablook's place. It's totally worth it for the backstory.

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More Answers

avatarDescribingHail路3 months ago

It's for the house next to Napstablook's.

avatarBackingPeck路3 months ago

The Mystery Key unlocks the house next to Napstablook鈥檚 in Waterfall. Inside, you get some fun lore about Mettaton!

avatarCompletingClint路3 months ago

The Mystery Key opens a house in Waterfall. Go check it out, it's near Napstablook's place.

馃憖 If you like Undertale...

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