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Undertale the locked door in.
Then snoop around there to find an another key that unlocks a hidden door behind the house.
Undertale by indie developer toby fox is a video game for pc ps4 vita and switch.
Nothing will open it not even the expensive mystery key item.
There is no other way to enter this building.
Save before talking to sans at the end then reload.
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.
By the way there s two other keys that you might want to check out if you already haven t.
Undertale is about a child who falls into an underworld filled with monsters.
First you have to get the key to sans room.
Come join the fun.
Glyde can be encountered in this room before fighting papyrus.
That key will open the back door.
To do that you have to save just before he judges you and then reload several times until he gives you the key.
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.
If you are defeated by papyrus instead of seeing a game over screen papyrus will capture you and lock you in the guest room.
After that you go into sans room and will find another key on a box.
It s not actually locked though and the bars are too wide to stop you from leaving.
To open this door you must dodge every name during the special thanks portion of the credits after a pacifist run.
Repeat a few times to get a key to his room.
Don t worry though he gives you a nice bed and some food.