Boom Boos as they appear in Super Mario Galaxy.

Bomb Boos are black Boos that will explode on contact. They first appeared in Super Mario Galaxy for the Wii in the Ghostly Galaxy, where Mario could swing the boos around using their tongue. If they hit something, then they would explode, possibly leading Mario to a previously inaccessible area. They're also used against Bouldergeist, the galaxy's boss.

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