Grab the Boomerang Flower from the ? Block at the start of the level, you’ll need to keep this Power-Up throughout the course of the level. Green Star #1 is just ahead and you need to toss a Boomerang to snag it, just watch for the Fire Piranha Plants. You’ll have to dodge some Fire Bars and lava panels then defeat some Para-Biddybuds. In the ice sector take the Clear Pipe for Green Star #2 then snag the nearby Double Cherry , it’ll really help.
Ahead are a bunch of Para-Biddybuds that you’ll need to take out but it’s not that hard, you can also score another Boomerang Flower at the beginning of this area. Be patient with going through the clear pipes, wait for the panels to appear. You’ll have to contend with Fire Piranha Plants as you make it to the end platform, don’t lose your Boomerang! At the end you’ll be on ice platforms surrounded by lava panels. Chuck a Boomerang over the lava to collect Green Star #3 then be patient with the clear pipe ahead.
Loop around in a circle until the panel appears then defeat the Mega Piranha Plants to spawn a Warp Box and head for the Goal Pole.