Bill Blasters armed with Cat Bullet Bills are located throughout the area, though curiously they don’t fire until you end up in one of the many roaming searchlights of this level. This is something you’ll need to exploit.
Green Star #1
The first Green Star demands that you take a springboard and use it to bounce high enough to reach it. Unfortunately, it’s in the path of a roaming searchlight, and you can expect a massive barrage to start the moment you are lit up.
Stamp
The Stamp is in plain sight just past the Checkpoint Flag, with the blocks you can use to retrieve it watched closely by a searchlight.
Use the small alcoves behind these pillars to slip past searchlights. You can also use a Goomba Mask taken from defeating a Goomba on the ledges above the searchlights.
Green Star #2
Watch for a cracked portion of wall shortly after collecting the Stamp. You must be spotted to start up the Cat Bullet Bill barrage, and lead them to destroy the wall. This reveals a Mystery Box that takes you to a bonus room. Here, you have 10 game seconds to climb large blocks to reach the Green Star before they are destroyed by an unceasing barrage of Cat Bullet Bills.
Green Star #3
The final Green Star is encased by blocks. You can try to use the Tanooki Power-Up to float straight into it, and Peach can break this challenge wide open with her float ability. If these are not options, try to lure Cat Bullet Bills into destroying the blocks to get access to the star.
Try to reach the Goal Pole without attracting a barrage of incoming Cat Bullet Bills: They can destroy the steps that you might need to use to reach the top of the pole.