World 1-Tower (New Super Mario Bros. Wii)

 is the fourth level in New Super Mario Bros. Wii and the first tower level in the game. This is the first level to feature Dry Bones and introduces the players to another new power-up, the Ice Flower. Larry Koopa is the boss of this level. It is unlocked by completing World 1-3, and its completion unlocks World 1-4.

Layout
At the beginning of the level, there is a rising brown platform, which brings Mario up and lets him hit a ? Block, which releases an Ice Flower. The flower will change Mario into Ice Mario, allowing him to throw Ice Balls. There is also a Dry Bones in this area. In the next area, there is another rising brown platform for Mario to stand on, which will lift him to the first of many swinging platforms. The swinging platforms go back and forth, allowing Mario to jump off one of the two sides. Mario must use this one to jump onto another platform, which has two extending brown blocks from the wall, which create a staircase for a few moments that Mario must jump up. The next area has another swinging platform with two different ways for Mario to go. The first is the easy way with two platforms and a Dry Bones at the top, and the second is the hard way with an extending platform and a Star Coin (plus multiple regular coins). In the next area, there are three platforms in a line that Mario has to jump up with Dry Bones coming on from the sides. There is once again a fork, which forces Mario to take either the easy way, which has several moving platforms creating another staircase, or the hard one with multiple immobile platforms for Mario to jump up. At the top of this area is the midway point.

The next area has a multitude of brown platforms going in and out of the walls, creating a staircase for a few seconds before they come together and crush Mario if he is in between them. There is a block with multiple power-ups (Propeller Mushroom, Star, 1-Up Mushroom, and Super Mushroom) followed by another swinging platform leading to a fork. Once again the easy path takes Mario to another (dual) swinging platform, and the hard one takes him to a prize, in this case, a 1-Up Mushroom. If he takes the easy path and is Small Mario, then he can slip through a hole and get the final Star Coin. The next area is a combination of five swinging platforms with the Red Ring and the Red Coins. To get to the top, and to the door that leads to Larry, Mario must use the extending brown platforms.

Boss fight
When Mario goes through the door that leads to Larry Koopa, Larry will be in the middle of the room. He will see Mario and jump in surprise, but then he will attack. Larry attacks by blasting bolts of blue magic from his magic wand at Mario in an attempt to hit him. Mario must dodge those attacks and get close enough to Larry to jump on his head to hit him. Larry will then retreat into his shell and start spinning around, trying to hit Mario. He will then try to jump on Mario, so Mario must avoid him. If Mario dodges these two attacks, then Larry will start shooting magical blasts again, and Mario can jump on his head again. Jumping on Larry's head three times will defeat him and complete the level.

Star Coins

 * Star Coin 1: To the top left of the second swinging platform (the one with the ? Block), the first Star Coin floats in a small opening in the rocks, to the left of many coins. Mario and co. must jump up from the swinging platform to get it.
 * Star Coin 2: At the top of the three parallel swinging platforms is a split path. The one on the right contains a hidden area. Mario and co. must use the Dry Bones on the right to jump up to this area, and continue jumping up to the second Star Coin.
 * Star Coin 3: Similar to the second Star Coin, above the Roulette Block is another split path. Mario and co. must use the lowest swinging platform to jump up to the second swinging platform, following the path on the right. Then, when the swinging platform swings to the left, the players should jump up to the third Star Coin, which is high up to the left.