At the start of this level you’ll want to grab the potted Piranha Plant since it will devour everything in it’s path. When you spot the shadow of the star move towards the screen and you’ll find Green Star #1 . Continue right to a block with a Super Bell so you can acquire the Cat Power-Up then cross the gap with the moving platforms to reach the Checkpoint Flag. Enter the door here to gain a new perspective. When you can drop down below the Mega Piranha Plant do so, then slash the blocks away so you can reach the Stamp .
Exit back into the 3D World and grab a potted Piranha Plant so it can eat away the Blurkers that hide a Mystery Box. Inside the Mystery Box, step on the P Switch then run underneath the steps to Green Star #2 . Cross the moving platforms to a door, but don’t go inside. Instead move to the next area to see Captain Toad cowering in fear. Move towards the screen and knock down the Bowser Board to receive Green Star #3 .
Now exit via the door and cap the Goal Pole.