New Super Mario Bros. Wii/World 1-4

Normal Strategy
This underwater level is very simple. Just maintain and use the Ice Flower, and you'll do fine. Jump over the Spiny Cheep Cheeps at the end, and finish the level.

Star Coins

 * Star Coin #1: When you see the first star coin, freeze the Cheep Cheep then jump on to him and jump to the star coin.
 * Star Coin #2: A short way after the first star coin, you see one wedged between two red pipes. Freeze one of the large Cheep Cheeps below then float underneath him up to the coin. Once you've got it let the currents thrust you back down.
 * Star Coin #3: At the sight of the third star coin, freeze the Urchin right as he is floating above the red pipe he will then sink down and block the bubbles, allowing you to swim to the star coin.

Enemies

 * Goombas
 * Urchins
 * Cheep Cheeps (red, green, yellow)
 * Spiny Cheep Cheep (purple)
 * Clams
 * Paratroopa

Items

 * Super Mushroom
 * Ice Flower
 * Fire Flower
 * Star
 * 1-up Mushroom
 * 8 Red Coins