Big Boo's Haunt

Big Boo's Haunt is one of the levels in Super Mario 64. It is present in several bloopers. It is a haunted mansion that is unsurprisingly full of Boos.

In Super Mario 64 DS, Yoshi is incapable of accessing this level as he is unable to devour Boos with his tongue. However, other characters are capable of possessing the level by punching Boos.