Start this level by moving up to the Double Cherry then to the corner for a Fire Flower . Get used to the controls then climb up to the right.
Destroy all the crates here to reveal another Double Cherry and Green Star #1 . If you need it, the bottom block has another Fire Flower but otherwise use the nearby pipe. When you drop down launch a bunch of Fireballs to defeat the Blocksteppers. Jump onto the middle of the P Switches to make the clones split and thus touch both panels at the same time, this reveals Green Star #2 .
Continue up to some more blocks with another Double Cherry then use the right pipe to ascend to the Checkpoint Flag. Climb up past the Blocksteppers to the left then hit the ? Block to raise the blocks higher and higher to the Stamp . Climbing higher still, you’ll encounter a Fire Bro but if you toss some Fireballs into the clear pipes you’ll take him out to reveal the final pipe. Jump onto the Multi-Vator at the left side with four clones to raise the platform up to Green Star #3 then cap the Goal Pole.