Koopa Planet (Along with Koopa Core) is the eighth and final world in Newer Super Mario Bros Wii.
Koopa Planet has a battlefield theme, with tanks, cannons, and fire.
8-1: Batallion Frontier
8-2: Jet Airship
8-3: Burnstone Flowfalls
8-Tower: Factory Tower
8-4: Molten Airship
8-Castle: Bowser's Castle
(8-Train thru 8-6 ,8-7 ,8- tower2 ,8-7 ,8-8 ,8-9 ,8-A are in Koopa Core)
8-Bowser's Castle: Bowser's Keep