From the Super Mario Wiki
Once the player reaches the four spinning platforms, they need to slide down the pole to the left. The player then has to use a tilting platform to reach another platform, followed by using a swinging platform to cross the gap. Then the player has to cross a series of Donut Blocks with a tilting platform between them, and jump across a gap while avoiding a flamethrower. Past the moving platform ahead is a gap with Donut Blocks across it, followed by a slight ramp and a few more Donut Blocks. After crossing these blocks is a large platform with a Purple Switch and triangle platforms. Pressing the switch will cause the triangles to flip upside-down, allowing the player to use them as platforms. The player needs to climb the platforms to reach the Power Star before the switch's timer runs out.
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