From the Super Mario Wiki
Many lifts and a Balloon Bully are found about this level, riding dotted paths. Lift Castle is also the windiest of the towers, and one "room" is actually a windy balcony full of machinery.
After a long journey the Yoshis found the castle at the end of the book. And the author of the story was none other than bad ol' Baby Bowser. But without shedding a tear, the Yoshis chased crybaby Bowser away.
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