World 8 is the final world in New Super Mario Bros. Wii, excluding the secret ninth world. The world has a total of ten levels. This is the only World without a Koopaling as a Boss.
The Fortresses 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 third and final fight with Bowser Jr., once again on an Airship. The final level features the two-part final battle with Bowser, who is not once seen in the game up until that point. The Enemy Course in the level are Podoboos between 8-3 and 8-Fortress on the bridge.
 Level Previews
 New Enemies