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

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

Layout
This course features fences that can be held onto, along with some Climbing Koopas that cling onto the fences. The player can sometimes also change which side of the fences they can hang on from.

Additionally, the spiked pillars that appeared in Wendy's Castle and the Valley Fortress back in Super Mario World make an appearance here. However, the are all horizontal instead of vertical.

Fishbones make their first appearance in this game here.

The player faces Wendy O. Koopa for a second time here. However, at times the water level will rise, which will render jump attacks useless while Wendy is underwater.

Star Coins

 * Star Coin 1: The first coin can be seen behind a fence in the first room. The player needs to flip to the back of the fence first before obtaining the Star Coin.
 * Star Coin 2: The second coin can also be easily seen after the first Star Coin. The player has to wait for the spiked pillars to return to get the Star Coin.
 * Star Coin 3: There is a green pipe just below the boss door. Through the pipe is an underwater area containing many Fishbones, two ? Blocks and the Star Coin.

Enemies

 * Spike Pillars
 * Climbing Koopas
 * Dry Bones
 * Fishbones
 * Ball 'n' Chains
 * Boss: Wendy O. Koopa