How to get the code word to Sans' room in Undertale
The code word to Sans' room is given to you by Sans himself, only if you've completed the true pacifist ending. So just be the best pacifist you can!
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To get the secret code to Sans' room, you gotta go through the True Pacifist route. Once you do, visit Papyrus and Sans' house after defeating Asgore and Flowey, and Sans will give you the key to his room. Be prepared for some mind-blowing secrets!
You have to be a good pacifist to get the key to Sans' room. Beat the True Pacifist route and talk to him!
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