The Piano puzzle is a puzzle that is present in Ao Oni versions Version 3 , Version 5 , and Version 6 . As the name implies, the player has to use the numbers written on the piano keys to solve a open a locked safe behind the bookshelf.
The numbers are 459 and the safe is located in the room behind the kitchen.
The numbers are random.
The numbers are randomized every game and the safe is located behind a bookshelf in the piano room.