From the Super Mario Wiki
The player starts off on a platform, and after dropping down from it, a Big Cosmic Clone forms and begins to chase the player onto some gear-shaped platforms that rotate. After this is a platform with two pillars and a Rectangular ? Block, that contains a Statue Leaf on it, which is next to a platform that is then raised by lava. There is then a walkway that leads to a section that has several Brick Blocks and Pillars on it which block the player's way. After this section is the bridge that leads to the Warp Box and the Goal Pole.