Big Boo's Haunt

Big Boo's Haunt, also known as Big Boo's Mansion, Boo's Haunted Mansion, Big Boo's Haunted House, and the Haunted House, is a three-story mansion owned by the Big Boo, located in a small carousel. It is the fifth course in Super Mario 64 and Super Mario 64 DS. Instead of accessing the course via a painting, the player must travel to the Mushroom Castle's courtyard after they have collected 12 Power Stars (15 in the DS remake) and defeat the Big Boo containing a small carousel. When near the carousel, the player's character shrinks down and enters it. It is the only course (in the original game) that does not share its theme with another course and has the most encounters with enemies containing Stars, with the Big Boo being fought three times and Big Mr. I. being fought once. The background is that of a moonlit night in a dark forest as well as howling wind.

In the DS version, this is the only main course that Yoshi cannot access entirely, since he can neither defeat nor eat Boos; this is also the only course to have a level inside it required to free another playable character, and it is one of two levels to have a secret level inside it (the other being Behind the Waterfall in the Hazy Maze Cave).

Layout
Big Boo's Haunt takes place within the carousel. There are two buildings in the course: the main haunted house and a wooden shack off to the side. Around the haunted house are several Scuttle Bugs, and an entrance to a secret room with a couple of Boos is at the back of the haunted house.

The haunted house consists of three floors, though only the first floor is accessible during the first mission (unless the player has unlocked Luigi in the DS version, in which case the player can easily jump to the next floor). The rooms of the first floor consist of, from left to right, a room with the Mad Piano, a room with a library, a room with a dungeon, a room with a collapsing bridge, and a room with a black pit and some platforms. If the player falls into the pit, it will lead them to the merry-go-round underneath. Once all the Boos and the Big Boo on the first floor are defeated, a staircase to the second floor appears.

The second floor has the same number of rooms as the first, as well as the course's Star Marker. The second door from the left leads to a library with books flying out of the shelves, trying to attack the player. The end of the library leads to the first room from the left, which contains a Power Star. The third room has a wire-frame grate floor above the dungeon room, the fourth room has several caskets that rise when the player approaches them, and the fifth room contains a bookcase with Bookends and a large tilting platform that will drop the player into the merry-go-round if they stand on it for too long. The door in the back of the fifth room leads to a blue block (or red in the DS version), and a door above on a ledge leads to the third floor.

The third floor consists of a small hall with doors to the balcony and a secret room containing Big Mr. I. In the DS version, a Luigi painting that brings Mario to the Big Boo Battle stage is also present in the hall. To access the room with Big Mr. I., the player has to be Vanish Mario or Vanish Luigi and enter through the large picture of a Boo before the power wears off. On the balcony lies the Big Boo, and the player can long-jump from the platform to access the roof.

The shack on the grounds of the haunted house leads to an elevator that brings the player to large halls when stepped on. At the end of the halls is a room with water and a merry-go-round in the center, accessed by doors on either side. The merry-go-round has a large spinning platform in the center and several portraits of Boos. One of the portraits has actual Boos come out of it, and another acts like a flamethrower.

Statistics

 * Total Number of Coins: 151 (160 in Super Mario 64 DS)
 * Caps Found: Vanish Cap (3)
 * Spinning Heart: (none)
 * Cannons: (none)
 * 1UP Mushrooms (2):
 * Static Mushroom: #1 On the top of the shack.
 * Box Mushroom: #2 On the top of the haunted house.
 * Warps: (none)

Other appearances and references

 * Mario Golf: Toadstool Tour: The haunted house makes an appearance on Hole 2 of Bowser Badlands in Mario Golf: Toadstool Tour.
 * New Super Mario Bros.: In New Super Mario Bros., the minigame Hide and Boo Seek is set in the main lobby of the haunted house. An arrangement of the merry-go-round theme from this course is also used in the minigame Lakitu Launch, which returns from Super Mario 64 DS.
 * Mario Strikers Charged: A remix of the merry-go-round's theme is in Mario Strikers Charged as Boo's theme whenever he scores a goal.
 * Mario Kart 8: The merry-go-round music is also used near the Aqua Cups area in Mario Kart 8's Water Park.

Trivia

 * If the player activates first-person view when Mario is close enough to enter the course, the player can still move the camera for a bit before the screen transitions to the mission-selection screen.
 * In the DS version, a green cap appears on the Boo in the back room of the first floor. By using hacks to enter the course as Yoshi, it can be shown that Yoshi is able to tongue the cap off the Boo and turn into Luigi as if the cap were on a normal Goomba.
 * The music for this level samples "46 - Untitled" by Zero-G.
 * The name of the 100-Coin Star is Beat the Boos!