This world has a lot of Super Blocks and Bob-ombs to help you get all the secrets. Go straight ahead and hit the ? Blocks to claim a Super Leaf . Climb up the wall and on the right side of the yellow platform, jump to reveal a hidden ? Block that has a Mega Mushroom. Smash through the blocks to the Green +Clock then drop down to the bottom-right area to smash all the Super Blocks.
Grab the Stamp from this area and use the Jump Panel to get back up. At the back wall are some Extension ? Blocks so hit them all to their max height and quickly ascend to find Green Star #1 inside the Mystery Box, performing the same actions you just took to reach it.
Jump into the Warp Box once you’ve grabbed the star and slide down the ramp to the Checkpoint Flag . There is a Super Leaf in the ? Block to the right and some Bob-ombs that you’ll want to pick up and toss onto the island with the Super Block. Breaking this block reveals Green Star #2 and you might have to use the Tanooki Suit to fly over to it if you left yourself a large gap.
Continue back to the right where you’ll need to locate all five Key Coins. Key Coin #1 is in plain sight and Key Coin #2 is just a ways to the right. If you smash the blocks to the left of the ? Blocks you can find Key Coin #3 and Key Coin #4 is on some blocks that lead to the bottomless abyss, so grab it before it there’s a gap. Ground pound the ? Blocks then climb up to grab Key Coin #5 but don’t exit yet! Break the Big Block above the Baddie Box to reveal a ? Block that will extend, so ground pound it to reach Green Star #3 .
Head back into the Warp Box then cap the Goal Pole.