World 5-Castle (New Super Mario Bros. Wii)

 is Iggy Koopa's Castle and the last level of World 5, in New Super Mario Bros. Wii. The player has to cross lava by means of grabbable grate, some of which is round and spins and some that retracts back into lava or walls. Green spells also attack from off-screen. The boss battle has Iggy with his pet Chain Chomp, which grows after being assisted by Kamek. It drags him around the room, and Iggy, who is riding in a seat attached to the Chain Chomp's chain, occasionally shoots spells. There is a platform in the middle of the rectangular stage with two Donut Lifts, and four Jump Blocks, two on each side of the room. When Iggy is attacked, the Chain Chomp will glow red and jump in random directions. When beaten, Iggy and his Chain Chomp will fall off screen and Mario will progress to World 6.

Star Coins

 * Star Coin 1: The first Star Coin is floating right above the lava between two walls. Mario and co. can obtain it either by falling to it and using a Propeller Mushroom to fly away before touching the lava, or with a well-timed wall kick.
 * Star Coin 2: Shortly after the first Star Coin, there is a grate wheel. Mario and co. must grab onto it and climb upwards on the left side to reach a hidden area with a Warp Door, which leads to an area with six Lava Bubbles and the second Star Coin which is floating above a grate platform. Mario and co. must avoid the Lava Bubbles, grab onto the grate, climb to the top, and finally jump to the Star Coin.
 * Star Coin 3: Shortly after the Checkpoint Flag is a row of grate platforms with the third Star Coin to the immediate left of the last one. Mario and co. must climb to the top of either the last grate platform or the one to the left of it while at its top-most point and jump to get the Star Coin.

Enemies

 * Lava Bubbles
 * Dry Bones
 * Big Chain Chomp
 * Boss: Iggy Koopa

Trivia

 * Iggy is the only New Super Mario Bros. Wii boss to be fought while he is in a ground vehicle (as Bowser Jr is fought while in an air vehicle).