World 2-4 (New Super Mario Bros. Wii)
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World 2-4 is the fourth level of World 2 in New Super Mario Bros. Wii. It is unlocked via completion of World 2-, and its own completion unlocks World 2-5 and World 2-6. A secret exit unlocks a shortcut to World 2-.
Every few seconds, a strong wind blows in the level, which causes Coins to blow in, effects ladders throughout the level, and forces the player to the right, though the player character is not moved if they are crouching.
The player starts in an area with a structure above, with the ? Block above it containing a power-up that can be reached by climbing the ladder. After another structure is a collection of Brick Blocks with a Koopa Troopa that can be used to break them and the ? Blocks underneath. After the red Warp Pipe, the player has to use the wind to jump over the ledge, unless they have a propeller suit. Climbing up another ladder, the player can get over a structure that leads into a group of Brick Blocks, followed by another platform above that has a power-up in a ? Block. After the red pipe ahead are two Brick Blocks, with the one closest to the red pipe containing a 1-Up Mushroom. Across the gap is the Checkpoint Flag.
Across the next gap is a hill of Koopa Troopas, with a barrel just before it the player can use to defeat them. In the top ? Block afterward is a power-up, followed by a ladder to reach the top of a long platform. Beyond this long platform are two jagged platforms with Spike Tops walking along them. After a gap is a hill of Koopa Troopas before the Warp Pipe leading to the Goal Pole.
This exit also requires a Propeller Suit. After the third Star Coin, there are two platforms with one Spike Top each. When the wind begins to blow, the player must perform a running double jump and fly up to the enclosed area with a red pipe. This secret exit leads to a warp pipe in the World Map, which leads directly to World 2-Castle.