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The Windy Mill is a windmill found in Gusty Gulch near Boo's Mansion during the events of Paper Mario. It looms ominously before the path to a Boo village. Underneath the windmill is a long tunnel leading to the chamber in which Tubba Blubba locked up his heart using the key Yakkey. The dusty, ancient windmill is cylindrical with a deep blue-plated triangular roof and the mill attached to its top, the main room is small and contains the well entrance to the secret underground chambers, and the inside also has various spinning clockwork and incessantly rotating gears.
It is possible that water was resourced from the well, given Goombario's tattles on the complex and the well entrance in the center.
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