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The Boomsday Machine is a giant mobile tower that appears in Super Mario Galaxy 2, created by Bowser Jr.. It appears as a boss, that is driven by Bowser Jr. in the galaxy, Bowser Jr.'s Boom Bunker.

It has a large arsenal, including the firebars, plasma cannons and fans that can suck and destroy clouds. It is the only boss in the game that is fought by Mario using the Cloud Mario ability. Its weaknesses include getting on top of it and using the ground-pound on the cockpit. In the third phase, the bottom of the machine comes out of the ground and becomes mobile, thanks to its tank tracks.

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