The Bowser Room

The Bowser Room is a single room in Super Mario 64. Nobody knows how to access this room, and it only appears on certain copies. It is said to be Miyamoto's favorite room.

Description
The Bowser Room is a small room with a white floor and grey walls, both tiled. In the room, there is a picture of Bowser with a blue and green background. Below the picture, there is a dark grey slope.

Theories
The room might exist if a player does something in-game, and as a result, they will be sent there.

Trivia

 * The Bowser Room was mentioned in an Oney Plays Crash Bandicoot stream.