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 on its pole, releasing the creature and make it collapse to a random wall or edge of the screen. Next, there is a high wall that cannot be jump over; instead, the player must use the Water Ball to proceed. The next area features two Chain Chomps, then a section starting with a Bill Blaster, two sets of blocks and multiple Water Balls. Another section filled with Chain Chomps, trapped between two walls of blocks. The player will then come to the Checkpoint Flag. 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 Ball and escape the area. Then is the final section of the level, with Water Balls, Bill Blasters surrounding the area firing Bullet Bills onto the bubbles, and the Flagpole.

Star Coins

 * Star Coin 1: Right before the Checkpoint Flag, the first Star Coin is blocked off by many Brick Blocks. To get it, 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 Pipe partially concealed by clouds (pictured). 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.

Enemies

 * Chain Chomps
 * Bullet Bills
 * Bill Blasters