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. During the ending credits, you must dodge the Kickstarter credits. You can’t hit and turn a single name yellow. Start a new game and reach the locked door. It will now be open. Click to see full answer. Thereof, how do I get through the door in Snowdin?To open this door, you must dodge every name during the special thanks portion of the credits after a pacifist run. The door will open for any future playthrough. Before entering, though, I show off a unique encounter in the area.Likewise, what do you do in Snowdin Undertale? This page can help you get through Snowdin after completing the Ruins. You will need to kill 16 creatures as well as Papyrus to meet the criteria for a genocide run in this section. After emerging you’ll come to a long snowy path. Continue along it until you come to a bridge where a shadowy figure walks up behind you. Additionally, how do you get through the door in Undertale? To open the door, the protagonist must dodge all the names of the Undertale Kickstarter backers in the end credits of the True Pacifist Route. There are other ways to get open the door, such as editing the SAVE data.What door does the mystery key open in Undertale?The Mystery Key only unlocks Mettaton’s house next to Napstablook’s house. You could also examine the Mysterious Door with the Mystery Key but the key doesn’t unlock that door. The Mysterious Door can only be unlocked if you avoided all the Special Thanks Kickstarter names in the credits of the True Pacifist ending.