World 4-Tower (New Super Mario Bros. Wii)

 is the Fortress level of World 4 of New Super Mario Bros. Wii.

Layout
This tower features a lot of conveyor belts. Metallic blocks are also a common sight here; some must be jumped on to advance, while others are more of a nuisance. If the player isn't careful, they may get crushed by the blocks. Wendy O. Koopa is fought here, at the end.

Star Coins

 * Star Coin 1: Found in the second room, the Star Coin can be obtained by jumping from a metal block which is about to fall.
 * Star Coin 2: There is a hidden alcove containing the Star Coin just below the checkpoint. Jump from the rightmost conveyor belt to reach the coin.
 * Star Coin 3: This coin is located in the last room before the boss door. If the player is playing alone and taking the secret exit (described below), the player won't be able to get this Star Coin (unless he or she has a Propeller Suit, which will still be extremely difficult). If playing multiplayer, one player rush to the secret exit (without entering the pipe) while the other wait to get the Star Coin. The player has to wait for the last metal block from each column to drop (except the leftmost column) and then jump on it. The player should then dash to the coin and back before the last metal block drops.

Secret Exit

 * In the last room, there are many metal blocks which are about to drop. Dash for the left wall, leaping over the gap, as quickly as possible before getting squished and jump into a hidden alcove in the wall with a Warp Pipe. The pipe leads to the castle's rooftop which contains the secret flagpole. This exit takes the player to the world's Warp Cannon, which takes the player to World 6.