Bouldergeist

Bouldergeist is a boss in the game Super Mario Galaxy. Its name is a pun on boulder and poltergeist. It is the boss of the Ghostly Galaxy. It seems to be based on Eyerok from ''Super Mario 64.

Combat
To defeat Bouldergeist you must swing Bomb Boos into him. After two hits he turns into a shadowy form then floats around. Swing another Bomb Boo into him and he will turn back to normal, except with hands. He has more attacks but you defeat him the same.