Big Boo is a recurring enemy/boss from the Mario series. As its name suggests, it is a Boo that is bigger and larger than a regular Boo. In Super Mario 64, it is found in Big Boo's Haunt, and Mario fights him three times, in the missions "Go on a Ghost Hunt", "Big Boo's Merry Go-Round", and "Big Boo's Balcony".