SM wiki icon.png

"Can everyone please stop telling jokes and start actually helping?!"
BJJ Wendy O Koopa and Captains.png Wendy O. Koopa is not happy. She has spotted broken links on this article. You can make her proud by helping MarioWiki editors create pages!

Bouldergeist (ポルタ Polta?) is a ghost with the power to control rocks in the Ghostly Galaxy, first appearing in Super Mario Galaxy. He holds one of the Power Stars and was the one who presumably captured Luigi. He reappears in the sequel, Super Mario Galaxy 2 as one of the bosses faced in the Boss Blitz Galaxy, presumably to get his revenge.


Physical description

Bouldergeist is a large rock monster-ghost who is entirely made out of boulders. The inside of his body is a black swarm of smoke.

Powers and abilities

  • Rock Manipulation: Bouldergeist can manipulate rocks and throw them at his victims.

In Super Mario Galaxy

Bouldergeist's lair is on the Bouldergeist Battle Planet. When Mario makes his way here and encounters him, Bouldergeist assembles his stone armor suit and atttacks.

Bouldergeist's main attack is throwing rocks, boulders, or stones at Mario. They are quite easy to avoid if the player runs in a straight line. However, he will occasionally summon a straight line of rocks, which hurts Mario if he is caught in it and restricts Mario's moving space. To defeat Bouldergeist, Mario must use his Star Spin to get the Bomb Boos produced from the black rocks the monster throws. After three hits, he reveal his true form: a black ghost. He will then try to run, spawning Bomb Boos in his wake. The player must use the Bomb Boos to hit him. In his second phase, Bouldergeist forms hands out of rocks. These rock hands give him new attacks such as slamming their hands into the ground or punching. Additionally, the rock geyser attack makes two lines instead of one. After Bouldergeist's true form is defeated a second time, the ghost's core explodes, and Mario can get his hands on the Power Star dropped by them.

The player can obtain a Power Star by completing a mission called Bouldergeist's Daredevil Run. In the mission, the player will start near the battle arena with one wedge of health. The player must avoid Bouldergeist's attacks and defeat him to obtain the Power Star.

In Super Mario Galaxy 2

Bouldergeist retains their attacks from Super Mario Galaxy in Boss Blitz Galaxy.


Bouldergeist is a portmanteau of "boulder" and "poltergeist". In geology, a boulder is a rock fragment, matching Bouldergeists affiliation to rocks. A poltergeist refers to a ghost or supernatural being responsible for physical disturbances throwing objects about, matching Bouldergeist throwing rocks at his target.


  • Bouldergeist is similar to Thardus in Metroid Prime. The two bosses are enormous rock monsters that can manipulate rocks.