I saw this question about how to open it, and I wondered what is inside it.

Has anyone seen this door? What exactly could be behind the mysterious door?!

I tried opening it but couldn't. Even tried lighting up the mushrooms with different sequences. Perhaps it is supposed to open in the second play through? Or maybe, you need to buy the key from those 2 girls [Bratty and Catty] who were selling trash?

Mysterious door

Seeing the tag of Undertale, fills me with determination.

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    This is not a duplicate question, the "dupe" question is "how to open", while this is a "what is inside" question. – Ave Jan 23 '16 at 22:08
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    @ardaozkal Good point. :/ – Haider Jan 23 '16 at 22:11
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    @ardaozkal Questionable. Until your edit, it was almost entirely "how do I open it." Even now, it's still mostly "how do I open it." Making it only "what's inside" would probably involve replacing almost the entire question. – Michaellogg Jan 23 '16 at 22:32
  • @MikeKellogg see the title. – Ave Jan 23 '16 at 22:34
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    @ardaozkal I do see the title. The contents of the question are far more significant. – Michaellogg Jan 23 '16 at 22:36

Behind the Mysterious Door lies a joke "developer" room. It contains only a few objects, each of which can be interacted with to show some text. The Undertale Wikia has a list of all of the text that the room contains.

Here's what the room looks like:

Screenshot of room contents

| improve this answer | |
  • 2
    It was a very anticlimactic secret. – user1337 Jan 25 '16 at 4:58
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    Oh?! And I thought this room had cure to Cancer or something. – Haider Jan 25 '16 at 7:28

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