I have beat the entire Super Mario Bros. Game for DSi, now I'm going back through the game. How do I get the last mystery box ( the 4th one) in the Blue Mushroom house??? I've got all the others ( silly backgrounds) but I can't get the 4th.
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You need more star coins from levels. That last wallpaper costs 20 star coins, so work out how many star coins you have & subtract it from 20. You will need that amount of star coins to unlock the last wallpaper.
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