Super Mario's developers had no imagination
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no there is not there are only nine worlds.
There are nine worlds in New Super Mario Bros. Wii. When you get all of the Star Coins in World One you unlock World Nine Level One and so on. World Nine is like Rainbow Road on Mario Kart.
You have to get the secret exit's in every world and the secret worlds
No sorry There Are 8 Worlds. -Matthew_JM