Where Does the Mystery Key Go in Undertale?

Best Answer

Just use the Mystery Key on the locked house in Waterfall near Napstablook's place. Get ready for some juicy details about Mettaton's past!

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More Answers

BackingPeck·3 months ago

The Mystery Key unlocks the house next to Napstablook's! It's Mettaton's house. Look out for some cool backstory and lore inside.

VitriolingMouth·3 months ago

Mystery Key? More like the key to unlocking Mettaton's dramatic history! It's the locked house in Waterfall.

HouselingMoon·3 months ago

Honestly, the Mystery Key is a bit overrated. It's for the locked house next to Napstablook in Waterfall. Not much else to it.

👀 If you like Undertale...

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