World 7-2 (New Super Mario Bros. Wii)

World 7-2 is the second level of World 7 in New Super Mario Bros. Wii. This area features floating Water Balls that Mario needs to finish the level. It is also the only area to feature normal Chain Chomps. Bullet Bills are also present.

Layout
The level starts with Mario in front of a Chain Chomp, under a set of ? Blocks. Mario can defeat the Chain Chomp by Ground Pounding its post, releasing it and causing it to run into the wall or the edge of the screen. Next, there is a high wall that cannot be jumped over; instead, the player must use a Water Ball to proceed. The next area features two Chain Chomps, followed a section with a Bill Blaster, two sets of blocks and multiple Water Balls. Another section filled with Chain Chomps is found, trapped between two walls of blocks. The player then comes to the midway point. After that, there are several more Water Balls, after which is a Warp Pipe hiding in the fog. If entered, the player must swim through more Water Balls above a pit and reach the end. The final section of the level contains Water Balls, Bill Blasters surrounding the area firing Bullet Bills onto the bubbles, and the flagpole.

Star Coins

 * Star Coin 1: Right before the midway point, the first Star Coin is blocked off by many Brick Blocks. Mario and co. must free the nearby Chain Chomp while it is facing the right so the Brick Blocks will be destroyed and the Star Coin will become attainable.
 * Star Coin 2: Near two ? Blocks and a Brick Block is a green Warp Pipe partially concealed by clouds. This Pipe leads to a hidden area with several Water Balls, and the second Star Coin is floating above the third one.
 * Star Coin 3: After emerging from the exit Pipe that led from the area with the second Star Coin, Mario and co. must go to the left and will see the third Star Coin in a small valley guarded by two Chain Chomps.