World 7-Castle (New Super Mario Bros. Wii)

 is the castle and final level of World 7 in New Super Mario Bros. Wii. The boss battle in this level is against Ludwig von Koopa.

Layout
In this level, there are numerous Skewers that the player has to avoid. They all vary in size and speed. Sledge Bros. also make an appearance here. Ludwig von Koopa is fought again here. The fight takes place on three moving platforms which change height at times. Ludwig fires four navy-blue fireballs, then jumps to a nearby platform with flutter jumping. While he is casting his spell is when the player should jump on him.

Secret room
If the player completes World 7-6, a vine leads them into a tower of the Castle. If they choose this path, they are taken into a hidden room of the castle. If the player goes through the pipe in the room, they are dropped right in front of the door to Ludwig's battle.

Star Coins

 * Star Coin 1: At least a Super Mushroom is required for this one. The first Star Coin is directly after the first area with six colliding Skewers, above a row of Brick Blocks and a Big Dry Bones. Mario and co. must wait for the platform to rise, then jump on the Big Dry Bones to break enough Brick Blocks to get the Star Coin.
 * Star Coin 2: After the duo of Sledge Bros are two giant Skewers. When they are retracted, Mario and co. must jump to the lower area in between them and enter the green Warp Pipe. This Pipe leads to a very cloudy area with two more giant Skewers, and the second Star Coin is all the way to the right.
 * Star Coin 3: Directly after the exit Pipe from the area with the second Star Coin is another area with several colliding Skewers. Inside is a ? Block which Mario and co. must hop onto and jump from to reach the third, hidden Star Coin.

Enemies

 * Skewers
 * Dry Bones
 * Big Dry Bones
 * Sledge Bros.
 * Boss: Ludwig von Koopa