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Bouldergeist is a sub boss from Super Mario Galaxy and Super Mario Galaxy 2. He is a huge rocky creature made of rocks and matter who kidnapped Luigi and trapped him in the Haunted Mansion. Additionally, he is the reason why Luigi was separated from the Toad Brigade and got lost in the Ghostly Galaxy.
Bouldergeist is a gray-rocky creature with yellow eyes. His hands are also gray.
In his true form which is revealed when Mario weakens him with Boo Bombs, Bouldergeist has a red uvula with a black face.
How to defeat the boss
Boldergeist is fought in the stage Beware of Bouldergeist, where he is on the final planet. Bouldergeist can create rocks from his matter to crush Mario, some are colored yellow that contain coins or black that contain Bomb Boos. To defeat him, Mario will have to spin two Bomb Boos via his Star Spin towards him to destroy his rocky armored face and a third to damage him while he is reduced to matter. He will reform, but now with two large rock arms. He can swipe and slam his arms, and even create a rock barrier that Mario can destroy using spins or Bomb Boos. Mario does not have to destroy the arms, but he will have to destroy his face again. Once his uvula-like core is hit with another Bomb Boo, the boss explodes and exposes the Power Star.
In the Daredevil comet, Bouldergeist will not throw golden rocks.
In Super Mario Galaxy 2, Bouldergeist is the fourth boss in the gauntlet and his defeat creates a Launch Star that leads to the next planet.
- Bouldergeist's name is a combination of "Boulder" and "Poltergeist", basically meaning "Ghost Bolder".
- In his second form, Bouldergeist resembles Cackletta's soul.