Koopa Planet (Along with Koopa Core) is the eighth and final world in Newer Super Mario Bros Wii.
Apearance
Koopa Planet has a battlefield theme, with tanks, cannons, and fire.
Levels
8-1: Battalion Frontier
8-2: Jet Airship
8-3: Burnstone Flowfalls
8-Tower: Factory Tower
8-4: Molten Airship
8-5: Bowser's Castle
(The rest are in Koopa Core)