The Boo's Boneyard Galaxy is a galaxy in Super Mario Galaxy. The only planet Mario encounters here is shaped like a skull. This planet has many large bones surrounding it, and an orange pipe on its head. The Warp Pipe leads underground to the rest of the galaxy. To unlock this galaxy, beat "Luigi and the Haunted Mansion" of the Ghostly Galaxy, and "Gateway's Purple Coins" of the Gateway Galaxy.
Skull PlanetThis is the main and only planet in the galaxy, that is almost surrounded by bones. On the inside is a large, maze-like race course, where Mario races the Spooky Speedster. If Mario Spins on the eyes of the skull, he will get three Star Bits.
Racing the Spooky SpeedsterTo get the Power Star, Mario must race the Spooky Speedster for the second time. The race is different this time, because Mario has used a Boo Mushroom to become Boo Mario in order to participate. Walls obstruct Boo Mario's path as he descends, and they are only passible when he is invisible; there are also fans that blow Boo Mario so that he may go faster. This mission is primarily side-scrolling. After beating the Speedster this time, another Power Star will appear.
- Skull Planet