Box's with wings
When your choosing which level to play look for the level that has the floating box on top of it and go it you hit the box that is there you useuly get somthing good like the thing where you get really big. P.S. Some times it's not as good but they are all helpful.
Theres loads more info this game, right here, with some cheats and tips, answers and New Super Mario Bros walkthrough.
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