New Super Mario Bros. U: Meringue Clouds-6 -- Snaking Above Mist Valley

This is an automatically sidescrolling level with few enemies. Activate the snake block to get going and you'll pass some Foos, clouds that produce fog. You can spin to clear it or kill them with a stomp or a shell. You can get the Acorn Mushroom here. The first Star Coin is under a piece of land on your path with a P-Switch. You can either go under the piece of land with the snake block or go up and over the land, then double back to the left. The snake blocks will move straight up so you can get the second Star Coin. After a while, you'll arrive at a pipe, which takes you to the midpoint. There's another snake block, with a Fire Bro nearby. Near the next piece of land is a Green Ring. The third Star Coin is floating over the void past some Parakoopas. Use a shell before the snake block blocks you to get it. At the end is a pipe to the flagpole. This opens the path to the castle and a Mushroom House.