World Star-6 (New Super Mario Bros. 2)

Most of this level takes place in an underwater fortress. It begins on a small emerged area of the fort, with a ghostly background and three Brick Blocks. To the far right there is a vertical passage with coins, leading to an underwater place, where Mario must reach a Warp Pipe avoiding Fishbones. This pipe leads the plumber to a horizontal, auto-scrolling corridor featuring more Fishbones, coins, blocks and other items. At the end of the passage, there is another Warp Pipe leading to the Flagpole area.

Moon Coins

 * Moon Coin 1: This Moon Coin can be easily collected at the start of the main area of the level. However, it's guarded by two Fishbones.
 * Moon Coin 2: Entering a purple pipe in the underwater area, Mario or Luigi can get the second Moon Coin in a small room.
 * Moon Coin 3: The third Moon Coin is at the end of the main space, among some Fishbones.