New Super Luigi U: Superstar Road-3 -- Star Coin Deep Dive

It's time to go swimming and your swimming buddies are blue Cheep-Cheeps and Big Bertha. Swim quickly and dodge them if you can't kill them. Bring a Fire Flower and try to keep it. There is an invisible block at the start with a Starman. The first Star Coin is in a ring of Cheep-Cheep. Let Big Bertha kill the Cheep-Cheep if you can't so you can reach the Star Coin. The second Star Coin will move along the currents created by the pipes. It will stop at the top of the screen. Ahead are rotating pipes, Red Coins, and Bloopers, some of which are in pipes. More blue Cheep-Cheeps will appear near the end. You'll have to chase the third Star Coin as it rides on the currents. It will lead you to the red pipe that takes you to the flagpole.