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: No less than a Super Mushroom is required for this one. To the left of the first giant Green Shell, there is a hidden area in the ground that is blocked off by Brick Blocks. After Ground Pounding through them, Mario and co. should run under the Green Shell and will see the first Star Coin floating right under it.
 * Star Coin 2: Similar to the first Star Coin, the second Star Coin is floating right under the second Green Shell. Mario and co. must swim inside the Green Shell, then jump up to the Star Coin.
 * Star Coin 3: Near the end of the level, instead of taking the usual exit Pipe, Mario and co. should use the Vine to swing into the third big Green Shell and will see a hidden Green Pipe inside. After going in the Pipe, Mario and co. should grab the POW Block to kill all enemies and make the third Star Coin attainable.

Enemies

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