Switch Star of Cool, Cool Mountain
From the Super Mario Wiki
In order to obtain this Power Star, Wario has to destroy the frozen pond where the Mother Penguin is by Ground Pounding in order to access the Star Sphere, and then the player has to ride the nearby gondola up to the floating island with the Star Switch and Bob-omb Buddy. Pressing the switch will cause the Power Star to temporarily appear in the Star Sphere and the player has to reach it in time before it disappears. If it does disappear, the player has to press the switch again.
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