World 2-Castle (New Super Mario Bros. Wii)

 is the castle and last level of World 2 in New Super Mario Bros. Wii. The boss battle in this level is against Roy Koopa.

Layout
This is an autoscrolling castle level filled with lava pits, and three way corridors, of which only one is the correct path, much like in Super Mario Bros. and Super Mario Bros.: The Lost Levels, if the correct corridor is chosen, a "ding" is heard, if wrong, a honk. In order to complete that area quickly, the player needs to take the upper route, the lower route, and the center route in that exact order. Podoboos are also common in this castle. If Mario and the gang stay too long near a wall the autoscrolling level will squish them causing them to lose a life.

Roy Koopa is fought here for the second time. He attacks by popping out of pipes that Kamek makes with his magic before the start of the battle. When Roy jumps out of a pipe, it might shock Mario (like a Sledge Bro). Mario also needs to avoid getting squished by Roy Koopa. Roy is defeated after getting hit three times. Upon his defeat, The player(s) will get the key to unlock World 3.

Star Coins

 * Star Coin 1: At the beginning of the level, the player must quickly propeller up to the Star Coin before the screen blocks it. If the player does not have the propeller suit, they must take the wrong path (middle) in the first fork.
 * Star Coin 2: Located in the second area which is easily seen. The player should destroy the Brick Blocks to grab it.
 * Star Coin 3: When the player hits the P-Switch in the third area, they should go across the Brick Blocks to get the Star Coin.

Enemies

 * Podoboos
 * Dry Bones
 * Piranha Plants
 * Boss: Roy Koopa