The optional mystery door is a locked door in snowdin forest.
Undertale locked door in forest.
A door in a place where sans appears twice on the same screen last edited by sekkuar666.
These doors can only be found in the deeper parts of the caves.
There s a path leading south with a cliff the dark cavern holes feature.
The door behind papyrus s house.
Feb 16 2016 5 05am showing 1 8 of 8 comments.
The mysterious door is an area found in snowdin forest south of the right side of the room with the icy x s and o s puzzle.
In some places the doors have fallen due to possible violent activity or perhaps natural cave shifting.
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Glyde can be encountered in this room before fighting papyrus.
The door which bears the delta rune is surrounded by glowing mushrooms and floating particles.