This level uses another unique mechanic in that you travel around in Clear Pipes a lot. Some paths are blocked by Spike Balls so you need to be aware of where you are going. Move through the first Clear Pipe then into the middle island where a Fire Piranha Plant can be defeated for a Fire Flower , a Power-Up you’ll use often here.
Enter the pipe and snag the Super Star before heading into the left section of pipes for Green Star #1 . Now exit at the right pipes to a platform with another Fire Flower for your stock. Shoot a fireball through the pipe to kill the Piranha Plant then follow through the pipe. Ahead you’ll see some Spikes Balls inside the bottom pipe. If you break them with the Fireball you can snag an easy 1-Up Mushroom on your way up. Fuzzies move through the entire next area so you need to time your entrance and exit in the clear pipes. The first one has a Green +Clock while the second has Green Star #2 .
The trick is to cycle around the top section until the Fuzzies pass then re-enter the main pipe. Hit the Checkpoint Flag then instead of using the Clear Pipe Cannon to shoot yourself to the other end, climb atop it. When the pipe turns toward the sky use a Spin Jump (or Cat Suit) to get to the top for a tricky Stamp placement.
In the next area you can quickly race up the wall with a Cat Suit or use the Clear Pipes to avoid the Fuzzies and find a Fire Flower on the second level with the clouds. At the top, shoot a Fireball into the Clear Pipe that goes into the air then follow it to a Cloud Cannon. This is a typical Cloud area where you race to the end using Dash Panels and claim the star at the end, but instead of getting a Super Star at the beginning you’ll want to snag a Piranha Plant. Grab Green Star #3 at the end of the run then slide down the ramp taking out the Piranha Plants in the process.
The final area requires you to find 5 Key Coins to use the Warp Box. Key Coin #1 is right at the entrance to the Clear Pipes, so get it then dash right dodging the Fuzzies. Grab Key Coin #2 and Key Coin #3 from the top right then either go up or down to reach the left side, depending on where the Fuzzies are. Get Key Coin #4 and Key Coin #5 from this symmetrical left side then head into the Warp Box. Move through the Clear Pipes here, exiting at the top to cap the Goal Pole.