After that you go into sans room and will find another key on a box.
Undertale the locked door in.
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By the way there s two other keys that you might want to check out if you already haven t.
The door which bears the delta rune is surrounded by glowing mushrooms and floating particles.
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.
Repeat a few times to get a key to his room.
Finally i got around to doing this.
Undertale by indie developer toby fox is a video game for pc ps4 vita and switch.
To do that you have to save just before he judges you and then reload several times until he gives you the key.
In the nintendo switch version examining the door leading to mad mew mew in the dog shrine before it is unlocked yields a message saying that the door is locked by a mysterious seal as an ominous piano jingle is heard.
Glyde can be encountered in this room before fighting papyrus.
That key will open the back door.
Then snoop around there to find an another key that unlocks a hidden door behind the house.
To open this door you must dodge every name during the special thanks portion of the credits after a pacifist run.
First you have to get the key to sans room.
Nothing will open it not even the expensive mystery key item.
Anyone that s started up undertale for the first time will encounter a mysterious locked door early in the game s snowdin area.
Save before talking to sans at the end then reload.
There is no other way to enter this building.
Undertale is about a child who falls into an underworld filled with monsters.