Big Boo's Balcony
From the Super Mario Wiki
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The player has to make their way to the far right room of the mansion's second floor. Once there, Mario has to Wall Jump up to the door above the entrance in the N64 version or use his Power Flower ability in the DS version. The player then has to go through the double doors to the right of the hall and defeat the Big Boo waiting on the balcony. After attacking it three times, the Big Boo will be defeated and the Power Star will appear on top of the mansion's roof. The player has to then Long Jump to cross the large gap between the balcony and the roof then climb the roof to reach the star. In the DS version, Mario's Power Flower ability will also work.
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