The door which bears the delta rune is surrounded by glowing mushrooms and floating particles.
Undertale locked door in forest.
The protagonist encounters the members of.
After confronting toriel and leaving the ruins the protagonist meets sans and papyrus in snowdin forest.
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There s a path leading south with a cliff the dark cavern holes feature glowing eyes.
To open the door the protagonist must dodge all the names of the undertale kickstarter backers in the end.
Sans jokes with them and papyrus attempts to jape them with puzzles.
It can be accessed just before the papyrus boss battle.
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.
It is seen after the protagonist defeats toriel and receives judgment from flowey in the ruins.
Walk east to enter the cave that leads north to the mystery door.
To open the locked door you must earn the true pacifist ending.
Undertale wiki guide.
Glyde can be encountered in this room before fighting papyrus.