World 6 is the sixth world in New Super Mario Bros. Wii. It is a tall mountain range with many pipes and Bullet Bills. The boss here is Morton Koopa Jr. and it also has an airship level.



  • The castle boss in this level is similar to the final boss of the original Sonic the Hedgehog, with objects popping out of the ground and trying to crush the player.
  • When the player enters a stage in World 6 and the “let’s-a go” scene plays, the world’s background glitches. The Bullet Bill enemies’ animation pauses, although everything else, including the Piranha Plant enemies and clouds, continue to animate.
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