ANSWERS: 3
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Here a video walkthrough: http://artport.whitney.org/gatepages/artists/galloway/ Here a complete guide: http://themushroomkingdom.net/smb_breakdown.shtml Further information: http://en.wikipedia.org/wiki/Super_Mario_Bros. I suppose that you could try to complete every world if you want to get all possibilities open.
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You have to unlock it by *spoiler* beating the world 6 boss with mini mario
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You have to beat the boss with mini mario
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