World 6-6 (New Super Mario Bros. Wii)

World 6-6 is the sixth level of World 6 in New Super Mario Bros. Wii. It's unlocked after completing World 6-5, and its own completion unlocks.

Layout
This level takes place in a dark underground cavern. There is a boat with a light that the player can move by rotating the Wii Remote. Various enemies, such as Piranha Plants, Cheep Cheeps, Swoops, and Fire Bros., make an appearance here. The water rises or lowers at some points of the level.

Star Coins

 * Star Coin 1: Mario and co. must get the POW Block and activate it while the raft is directly under the four coins to the left of the green Warp Pipe with the Piranha Plant. This makes the first Star Coin fall onto the raft.
 * Star Coin 2 (pictured): Mario and co. must put the trampoline located shortly after the Checkpoint Flag on the raft and use it to obtain the second Star Coin to the left of three Swoops.
 * Star Coin 3: Mario and co. must obtain the Propeller Block and use it to get into the rock passage directly to the right. The third Star Coin is then all the way to the left.

Secret Exit
A secret exit exists in this level which can be found by entering a red pipe in the area with Fire Bros. The player enters an area with a Glow Block, along with a Swoop swarm. After that area is the Red Flagpole. This unlocks a Warp Cannon which takes the player to World 8. Players can run through this level with a Mini Mushroom by dashing across the water.

Enemies

 * Cheep Cheeps
 * Mega Cheep-Cheeps
 * Piranha Plants
 * Swoops
 * Fire Bros.