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.

Enemies

 * Podoboos
 * Spiked Balls
 * Dry Bones
 * Super Dry Bones
 * Boss: Morton Koopa Jr.