Bill Blasters will be firing Cat Bullet Bills every time you enter a searchlight, so avoid them at all costs. Snag the Super Leaf from the ? Block at the beginning then cross over the long bridge where Bill Blasters are just waiting for you to make a mistake. Clear out the Hop-Chops and use the springboard to reach Green Star #1 just after the bridge, the downside is that it’s in the path of a searchlight. Turn the corner making your way to the Checkpoint Flag where you can spot the Stamp high above in plain sight.
Use the blocks to climb up and avoid the searchlight along the way. If you can make your way to the top row in the next section do it, you’ll find a Goomba Mask and some coins. Drop down between the two columns to spot a cracked portion of the wall. Dodge a Cat Bullet Bill so that it hits the crack to reveal a Mystery Box. Inside you need to quickly climb to the top and grab Green Star #2 before the Cat Bullet Bills destroy the wall (and the timer is only 10 seconds).
Outside near the columns you can hit the Red Ring , collecting the red coins nets a Super Leaf which helps going forward. At the corner to the right are some Green +Clocks to help extend your time. Start climbing up the wall and dodge a Cat Bullet Bill to free up Green Star #3 before you make the leap to the Goal Pole.