How to Access Sans' Room in Undertale
To get into Sans' room, you need to get the key from Papyrus. After you beat the game, Papyrus sends you a 'Key to the Room of Sans'.
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If you've completed the True Pacifist ending, check your inventory for an item called the 'key'. This unlocks Sans' room.
First, you need to be on the True Pacifist route. After you complete the game, Papyrus will send you a text with the key to Sans' room!
Good news: you don't actually need to do anything special in-game to get into Sans' room. Bad news: you can't get in during normal gameplay.
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