World 6-Castle (New Super Mario Bros. Wii)

 is the Castle of World 6 in New Super Mario Bros. Wii.

Layout
In this level, there are Spiked Balls and Giant Spiked Balls that can hurt the player, they can also destroy Dry Bones. It is set above a pool of lava with moving platforms. The castle features two areas, the first area being composed of pendulum platforms that dip into the lava, and the second area being highly infested with Spiked Balls, which drop from the ceiling in vast numbers.

The player faces Morton Koopa Jr. again in this castle. The room's floor is composed of six stone pillars, which Morton uses in his offensive tactics. When he gets close enough to a player, he will jump and ground-pound, causing the pillars on opposite sides of him to shoot up to the ceiling, which will kill the player if they get crushed.

Star Coins

 * Star Coin 1: The first Star Coin floats over a row of Brick Blocks with a Dry Bones on every one. The easiest way to obtain it is to get an Ice Flower, freeze a Dry Bones, then throw it across the row of Brick Blocks, killing all of the Dry Bones and getting the Star Coin.
 * Star Coin 2: The second Star Coin is floating high over the swinging platform with three ? Blocks and a Spike Ball. Mario and co. must get on top of one of the ? Blocks and jump from it to the Star Coin.
 * Star Coin 3: The third Star Coin is just before the door leading to Morton. Mario and co. must go to the right edge of the final swinging platform, wait for the platform to swing all the way to the right, and jump for the Star Coin.

Enemies

 * Lava Bubbles
 * Spiked Balls
 * Dry Bones
 * Big Dry Bones
 * Boss: Morton Koopa Jr.