According to the back of the Japanese game packaging, there are Assist Blocks in the game that serve a similar function to the Super Guide in New Super Mario Bros. These blocks, emblazoned with the iconic P-Wing of Super Mario Bros. 3 fame, will bestow special items once opened. If one of these special items doesn't grant Mario infinite flight throughout the level, I will be severely pissed.
There's also a SpotPass feature that allows you to exchange items and possibly more with other players. I hope we get more details on that as well as on the Assist Blocks very soon.
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