Big Boo's Haunt

Big Boo's Haunt is the fifth course in Super Mario 64. The course is entered through defeating a Big Boo in the Castle Courtyard and entering the cage, it drops, though, in certain personalized copies, it can be entered through alternative means, though it is unknown. It is a large, three-story mansion trapped inside a large gate around it. The mansion itself contains many rooms behind doors, as well as many Boos.

Many anomalies have been reported in this course, seemingly due to it's 'haunted' nature.

Missions

 * 1) GO ON A GHOST HUNT
 * 2) RIDE BIG BOO'S MERRY-GO-ROUND
 * 3) SECRET OF THE HAUNTED BOOKS
 * 4) SEEK THE 8 RED COINS
 * 5) BIG BOO'S BALCONY
 * 6) EYE TO EYE IN THE SECRET ROOM
 * 7) 100 COIN STAR

Ghoul Medal
On the sign outside of the mansion, a 'Ghoul Medal' is mentioned. Although it was commonly assumed to be a play-on-words for 'Gold Medal,' certain personalized copies supposedly reveal that it is a real collectible that can be found inside the mansion. The way it is obtained varies according to people who have played said personalized copies. However, it is most commonly gained by beating an enemy known as the 'Giant Boo,' which is allegedly double the size of a Big Boo. It requires ten hits to defeat, though the way he is summoned and his location varies depending on the personalization. For example, one player claims that Giant Boo can be summoned by allegedly glitching the Crazed Crate inside the mansion by clipping into it while bouncing and reaching a hidden room where Giant Boo can be found. In contrast, another claims that he can be found by clipping under the mansion by using the elevators and warping to a secret room where Giant Boo resides.

The actual use for the Ghoul Medal is unknown, it takes the appearance of a circular medal with a Boo on it, and collecting it displays Mario's animation when grabbing a key from Bowser. Aside from the texture of the Ghoul Medal appearing next to the player's save file, it supposedly serves no other purpose.

Big Boo's Forest
Main Article: Big Boo's Forest

Big Boo Forest is an alleged secret course that can be unlocked inside Big Boo's Haunt. Backwards Long Jumping most commonly accesses it from the roof of the mansion out of the gate. Alternatively, it can also be obtained by using the Crazed Crate and jumping out of the gate.

Big Boo's Key
An item that can be obtained by defeating specific Boos. Although it is used as an unused item in unpersonalized copies of Super Mario 64, it can be obtained normally in certain personalized copies of the game. Its use varies from copy to copy. In some copies, certain doors are locked, and can only be opened by obtaining a key, other copies it is used to raise the stairs inside the mansion. In some copies, it serves no purpose at all, baffling players.