World 4-1 (New Super Mario Bros. Wii)

World 4-1 is the first level of World 4 of New Super Mario Bros. Wii. This level introduces Mega Urchins and is mostly submerged in water.

Layout
This level has two choices right from the start-platforms or water. The player can clear the level by jumping on platforms or only being in the water. This level has Urchins, Mega Urchins, Cheep-Cheeps, Spiny Cheep-Cheeps, and other enemies like those.

Star Coins

 * Star Coin 1: This Star Coin is found near the start of the level, high above the water. The player needs to swim down and freeze the Piranha Plant underwater, using it as a platform to reach it.
 * Star Coin 2: Somewhere after the checkpoint, the player can hear a sound from a Roulette Block. The player should go into the water, move further down, and swim up to find an Urchin and the Star Coin. The player needs to freeze it and use it as a platform before it breaks free. (The Roulette Block is in a hidden aclove just left of the Star Coin)
 * Star Coin 3: Near the exit, the player should be able to see two Urchins next to a pipe with a strong water current. The player should freeze the two Urchins and use them as a platform to reach an alternate exit pipe before they break free. The Star Coin is located above this pipe.