Right from the start you’ll be faced with enemies, in this case it’s two Fire Bros. Defeat them and touch the sliding doors then the gong to summon a pipe. Clear a Boomerang Bro then a Goomba Tower. Around the corner through the doors is the first of five Key Coins , with Key Coin #1 placed underneath the steps.
Head back and ascend the steps to find two Hammer Bros. that should be taken out before grabbing Key Coin #2 . Hit the ? Block to get a Baseball that you can toss through the wall of Blurkers to hit the gong, likewise use a Boomerang. Ahead is a Fire Bro atop a Goomba Tower that needs to be defeated. Slide open the doors now and hit the gong to reveal sleeping Goombas and Key Coin #3 . Bring the baseball with you as you climb the steps then throw it into the clear pipe so you can safely acquire Green Star #1 .
Behind the sliding doors is another Hammer Bro and spiked flooring, but also Key Coin #4 . Toss a Boomerang or make a well-timed run to claim it then continue right. Grab the Green +Clock then toss a baseball through the Blurkers and into the gong to reveal Key Coin #5 and unlock the Warp Box .
Outside, snag the Checkpoint Flag then head to the far right, avoiding the Green Star Ring for now. Acquire a Propeller Box then hit the Green Star Ring so you can quickly acquire all eight coins and Green Star #2 . Fly up on the left side to find a Warp Box that takes you to a bunch of coins and Green Star #3 . Now you can fly up to the Goal Pole, it moves but it’s easy to drop on top with a Propeller Box equipped.