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you don't. only the wii version has it. The only secret worlds are 4 and 7 whick you have to use a mini shromm to defeat the boss in worlds 2 and 5. you can also unlock stars bside your file by completing the game once, beating all the levels, and getting and spending all your star coins.

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14y ago
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14y ago

by getting every single star coin there is

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14y ago

you must be tiny when you finish the last castle in world 6.

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Q: How do you unlock all the levels in world 9 of super Mario bros wii?
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