The rainbow platforms in the beginning are occupied by groups of Skipsqueaks and Spiny Skipsqueaks, while Ring Burners fire rings across the platforms.
Green Star #1
When you find a set of blocks hanging over rolling rainbow platforms, use the Cat Power-Up to climb up from those blocks to find a pipe leading to a bonus room. Here, you must guide two green balls to their respective goals by manipulating Red-Blue Panels with jumps. Do this one sphere at a time; it’s a lot easier that way.
Stamp
Plessie meets you after the Checkpoint Flag for a short ride. Don’t miss the Stamp hidden in between a set of Gold Rings on the right side of the water slide, next to a Splounder.
Green Star #2
You can get the second Green Star after the short Plessie ride. Two unlit torches are next to a huge door, and lighting the torches opens it to reveal a Cloud Cannon. You can score a Fire Flower from a hidden ? Block next to the door.
The Cloud Cannon sends you to a bonus area. You have to run across a set of Color Panels to recreate the old appearance of a certain green-clad hero while avoiding Parabones. This can be done faster through ground pounding and the help of a Mega Mushroom hidden in the area.
Next to the door that guarded the Cloud Cannon is a set of rainbow ring platforms. The first of these has a Green Star Ring on it. Collecting the Green Coins can be tough, as Spiny Skipsqueaks and Ring Burners work together to slow you down.
This can be a brutal section, but fortunately it’s also the final stretch. The small rolling platforms are actually less safe than the trapezes in between them. Remember, you can make a trapeze swing farther to gain distance for longer jumps! Be careful with the Skipsqueaks and the Para Para-Biddybuds in this area. They can ruin otherwise perfect jumps.
The steps leading up the Goal Pole have P Switches that drop Coins into the area, with the last switch dropping hundreds into a bottomless pit. Don’t get distracted by the wealth and fall to your doom while in sight of the finish!