New Super Mario Bros. Wii 2-4 QSC

It's best to have the Propeller Suit in this level. After the midgate is a green pipe tucked under a ledge. The pipe takes you to the 2nd Star Coin. Go to the pipe when the wind isn't blowing. Use the Propeller Suit to get the Star Coin and go to the next pipe. Jump first, then use the suit so you'll have enough power to make it back up. The Star Coin is under a rock platform in a formation of coins that looks like a Fire or Ice Flower. After you exit the pipe, wait until the wind blows and jump out over the abyss and use the Propeller Suit to get the 3rd Star Coin and reach the ledge above. Then continue your way to the goal.