Bouldergeist appears as a stage boss in Super Smash Bros. Fusion, appearing on Ghostly Galaxy. While classified as a stage boss, he himself doesn't attack the fighters, instead raising platforms and pillars from the stone ground. He is damaged by destroying the stone platforms and pillars, with his attacks being quicker and the size of the pillars increasing. When he is defeated, he crumbles into the ground, which makes boulders rain from the sky for several seconds.
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