World 1-1 (New Super Mario Bros. Wii)
World 1-1 is the first level of New Super Mario Bros. Wii. It begins immediately outside Peach's Castle and introduces the player to a new power-up, the Propeller Suit. Its completion unlocks World 1-2.
Princess Peach's Castle can be seen in the background at the beginning of the level, just as in New Super Mario Bros. There are also three ? Blocks, a few Brick Blocks, and a Goomba. To the right are some moving sections of land, the latter of which has three platforms above it, and a green Warp Pipe within it that leads to a room with coins, Brick Blocks, and a P Switch. The midway point can be found ahead.
If players have the Propeller Suit, which is accessible in several ? Blocks, they can access a Red Ring on a platform in the air. Further along is a rolling hill with a secret alcove; if the player jumps onto the green Pipe and waits, they are brought to an area with three hidden 1-Up Mushrooms and dozens of coins. The Pipe itself leads to an area with a Star Coin. After the player jumps over a few pits, the flagpole can be seen past the final rolling hill.