Megahammer is a robot like character that appears in Super Mario Galaxy 2 as a boss for the galaxy Bowser Jr.'s Fearsome Fleet. He is one of the only two bosses in the game that are fought by Mario and Yoshi together, the other being Giga Lakitu. His attacks include launching Bullet Bills at Mario, or attempting to smash Mario with two giant hammers. His weaknesses include the big, blue, round, glass windows on his back and on his belly.

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