World 5-1 (New Super Mario Bros. Wii)

World 5-1 is the first level in World 5 in New Super Mario Bros. Wii. It introduces the Stalking Piranha Plant and the River Piranha Plant. There are large Koopa Shells throughout the level. While most of this level takes place on land, a portion of it is over a body of water. There are many swinging vines that the player can use to travel over gaps and Stalking Piranha Plants.

Star Coins

 * Star Coin 1: The Star Coin is located directly below the only Roulette Block in the level, in the shell. To enter, the player must gound pound an odd depression on the ground slightly before the Roulette Block, which are hidden brick blocks to reveal the hidden aclove containing the Star Coin.
 * Star Coin 2: Just before the checkpoint there is a Cheep-Cheep and a River Piranha Plant beside a large shell. The player have to swim into the shell to find the Star Coin.
 * Star Coin 3: Just before the pipe leading to the flagpole, there is a vine and a red flying Koopa Troopa beside another large shell. The player has to use the vine to jump onto the Koopa Troopa to reveal another hidden aclove with a pipe in the shell. Through the pipe is an area with water, two River Piranha Plants, a Stalking Piranha Plant and the Star Coin.

Enemies

 * Stalking Piranha Plants
 * River Piranha Plants
 * Koopa Paratroopas
 * Koopa Troopas
 * Cheep-Cheeps