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Mario and Yoshi in Bowser Jr's Fearsome Fleet

Bowser Jr's Fearsome Fleet is a galaxy in Super Mario Galaxy 2. It is where Megahammer is fought. Upon defeat, it will grant you the fifth Grand Star, and progresses you to World 6. You use Yoshi to eat a Banzai Bullet and hit one of the glass shields on Megahammer. Do this 3 times to the front and 3 to the backside of Mega hammer.