World 4-1 (New Super Mario Bros. Wii)
From the Super Mario Wiki, the Mario encyclopedia
The player begins the level on land, near a platform above the water with two ? Blocks above it. The player must then travel through a section of water, where Urchins, Cheep Cheeps, Big Cheep Cheeps, and a Piranha Plant are encountered. A piece of land with a Koopa Troopa, a Red Ring, and two ? Blocks is in the section. Afterwards, two currents coming out of Warp Pipes are found, along with a wall that leads underwater. A group of Spiny Cheep Cheeps follow, along with a platform with a ? Block containing a Super Star. The midway point then follows. The player must then go into the water, where more Urchins and Warp Pipe currents are located. A Roulette Block is hidden in the wall above. A section with Big Urchins follows, with Koopa Paratroopas flying above. After a Big Urchin with two Urchins, a structure made of Brick Blocks and ? Blocks is encountered. Underneath the last Big Urchin, there is a Warp Pipe leading to an area with three Clampies. After a section with more Urchins and currents, a Warp Pipe leading to an area with a Koopa Paratroopa and the flagpole is found.
A Penguin Suit is required for all three Star Coins.