It is known to be one of the most complex battle stages in Mario Kart: Double Dash!! as there are two floors: a hallway and a ballroom. There are three entrances into the hallway, all of which lead to a central point, which can create some tight battles. The ball room is just a flat room and the main "hub" of the mansion.
Boos occasionally appear on the second floor and make their "boo cackle". The roof has one entrance, but a large hole in the middle drops back down to the second floor. The stage can be unlocked by winning first place on the 150cc Mushroom Cup.