I found this info on a japanese website. The translation through babelfish was a bit iffy but I managed to make this much out from reading it-
*Level 4 is Ice Paradise(this is the city in the snow we have seen)
*Level 5 is Sky Canyon(no shots of this zone yet)
*There apparently will be 9 levels
*Sonic can do the bounce attack from SA2.
*Knux can do the Drill Claw from SA2(not sure if he can dig though)
*Cream throws Cheese by tapping B.
*Apparently only Sonic is availiable at the beginning, you have to unlock the others
Here's the link:
village.infoweb.ne.jp/~fw.../sav2.html
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