Eye to Eye in the Secret Room

Eye to Eye in the Secret Room is the sixth mission of Big Boo's Haunt in Super Mario 64 and Super Mario 64 DS. In Super Mario 64, it is the final mission of the course, and in the DS version, this mission can be completed only with Luigi. The mission's objective is to defeat Big Mr. I in a secret room on the third floor of the haunted house. The mission Bowser in the Dark World must be completed to do this mission via unlocking Vanish Cap.

Layout
The player has to enter the far right room of the second floor and make their way to the door on the opposite side of the room, avoiding the Bookends and the tilting platform. Behind the door is a blue block (or red in the DS version). The player has to grab the power-up from inside, jump up to the door above in the previous room, and enter the secret room behind the Boo portrait, all before the power-up wears off. Once inside the room, the player has to defeat Big Mr. I by running around him until he shrinks and disappears. Once he does, the Power Star will appear.