Showdown at Bowser's Castle
From the Super Mario Wiki, the Mario encyclopedia
The mission begins at the location of the previous mission. Mario must enter a doorway and subsequently capture a Pokio. After evading a Stairface Ogre, Mario must make his way across some moving plaster walls, some of which have some regional coins. Once he makes it all the way to the top, Mario must capture a spark pylon and make his way to the rooftop, where Bowser will escape with Princess Peach and Tiara. Mario will then be forced to fight the RoboBrood; if he defeats it, he will be awarded a Multi Moon.
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