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Newer Super Mario Bros. Wii
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Koopa Planet
Game Newer Super Mario Bros. Wii
World number 8
Levels 6
Bosses None
Joined World Koopa Core
Game Progression
Previous world (7) Sky Mountain/Starry Skies
Next world (9) Special World

Koopa Planet is the first section of the eighth world in Newer Super Mario Bros Wii, with the rest of World 8 being in Koopa Core. It is the battlefield-themed front of Bowser's very own fortress.

Despite having a tower, a castle, and technically two airships, none have bosses. Thus, all of World 8's bosses are fought in Koopa Core.


Koopa Planet is a volcanic fortress owned by Bowser on a floating island in space. It has a heavy battlefield theme, tanks and airships are found a lot within. Prior to Molten Airship, the player ventures at the fortress' front, while after completing Factory Tower, they will end up at the fortress' top, which is full of lava. Upon completing Bowser's Castle, it is revealed that Koopa Planet was just a setup for Koopa Core.

Koopa Planet can only be accessed through completing Spaceship Koopa in Starry Skies. Completion of Bowser's Castle grants access to Underground Railroad in Koopa Core.


Level number Level name Preview Description
8-1 Batallion Frontier BatallionFrontier.png A tank-filled autoscrolling level reminiscent of Super Mario Bros. 3 and Super Mario 3D World. Some tanks emit clouds of poisonous exhaust, which must be cleared by Spin Jumping nearby.
8-2 Jet Airship JetAirship.png An autoscrolling airship level with a vast supply of Burners. It has no boss of its own.
8-3 Burnstone Flowfalls BurnstoneFlowfalls.png A lava-themed area filled with Bob-ombs and Lava Geysers.
8-Towernsmbw.png Factory Tower FactoryTower.png A tower featuring Bob-ombs, Conveyor Belts, and spikes. It has no boss of its own.
8-4 Molten Airship MoltenAirship.png Another airship, this time featuring wavy lava. It has no boss of its own.
8-Castlensmbw2.png Bowser's Castle BowsersCastleWii.png A fake out Bowser's castle which segues onto Koopa Core. It has no boss of its own.


  • This is the only major world that does not have a boss. The other boss-less words are bonus worlds.