Where Does the Mystery Key Go in Undertale?

RepeatingRitz·2 years ago

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ReroutingTopaz·2 years ago

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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BackingPeck·2 years 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·2 years ago

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

HouselingMoon·2 years 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.

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