By getting a cannon or by winning the fifth castle and then the sixth castle.
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They call it Super Mario Bros Wii for a reason
For New Super Mario Bros., You reach level 7 by defeating the level 5 final boss (Petey Piranha as mini Mario
First, u get mini Mario the go to World 2 and beat the boss with mini Mario. It will unlock World 4.
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.
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