World 8 (New Super Mario Bros. Wii)

Bowser's Volcano is the eighth world of New Super Mario Bros. Wii. It is also the final world, excluding the secret ninth world, Rainbow Path.

The Tower here leads to a fight with Kamek, who previously in the game is only seen enhancing the Koopalings when the heroes reach them in Castles. This world also features the second fight with Bowser Jr., once again on an Airship. The final level here features the two-part battle with Bowser, who is not once seen in the game up until that point.