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. Completion of the level unlocks World 8-1 (New Super Mario Bros. Wii).

Layout
This level begins near two giant Skewers, with a Dry Bones and two ? Blocks on a platform in between. Some moving metal platforms are encountered, with Skewers in between them. Dry Bones and a Big Dry Bones are found around the metal platforms. A fast Skewer is found before the midway point. A metal platform with a ? Block above it is after the midway point, with Skewers around it. Two Sledge Bros. are encountered by the player, along with two giant Skewers. A lift with Skewers around it is found, along with a group of three Skewers together. A ? Block is found, followed by a long line of Skewers. Following the last set of Skewers, a Sledge Bro can also be found before the boss door. A Hidden Block containing a Propeller Mushroom is present.

Ludwig von Koopa is fought again here. Magikoopa forces the fight to take place on three moving platforms which change height at times. Ludwig fires 4 indigo fireballs, then jumps to a nearby platform with flutter jumping. While he is casting his spell, the player has enough time to jump on him. After three stomps, he is defeated.

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 with three blocks. 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.