World Star-1: Rainbow Run

Start by jumping onto the rotating rainbow platforms, avoiding Skipsqueaks, Spiny Skipqueaks, and Ring Burners.

On the second rotating platform, hit the ?-Block to get a Super Bell.

Continue across more rolling rainbow platforms, noting the Blocks above one of them.

Climb the wall to find clock pickups and a green pipe. Enter the pipe.

In the puzzle room, guide two balls to activate switches using Flip Panels. For the left ball, activate a red panel first, then both balls in the bottom right. For the right ball, activate a blue panel above, then a red panel in the bottom left. This rewards Green Star #1.

Exit the pipe and proceed to a Warp Box that leads to the Checkpoint Flag and Plessie.

Ride Plessie. The Stamp is located on the right side, between some coin rings.

After Plessie, you will see a door with two unlit braziers.

To the left of the door, perform a Ground Pound on the ground to find a hidden ?-Block containing a Fire Flower.

Use the Fire Flower to light both braziers, which opens the door and reveals a cloud cannon.

Enter the cloud cannon to reach a bonus area. Light all the tiles on the floor to reveal a hero and earn Green Star #2.

Exit the bonus area. A Green Star Ring will appear on the next rainbow platform.

Collect all the coins from the Green Star Ring while avoiding Ring Burners and Skipsqueaks. This rewards Green Star #3.

The final section features more rotating platforms, Skipsqueaks, and trapezes. Be careful not to fall into the pit.

Take the Warp Box at the end to reach the Goal Pole area. The P-Switches here only spawn coins.