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The Windy Mill is a windmill at the bottom of Gusty Gulch near Boo's Mansion in 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.
In Chapter 3 of the game, Mario and his partners steal Yakkey from Tubba Blubba's Castle and use it to open the mill. Inside the mill is a well covered by a wooden floor and three passages down the well, each with a roaming Hyper Goomba and a "no entry allowed" notice. Deep below the mill, Mario finds Tubba Blubba's Heart and defeats it, therefore weakening Tubba Blubba's power considerably. Tubba Blubba chases down and reunites with his heart near the mill, but is easily beaten. Mario's new partner Lady Bow decides to accompany him longer as well as giving him the promised Star Spirit, marking the end of the Chapter. Later in the game, Yakkey can be found in the mill, hoping to guard a new secret.
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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