You could but you need cheats to get it.Try using gamespot.com to find a savedata.
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That it a hero mask on the hero patapon.
No
There is no difference. Don Chaka is just a sub title in some releases.
There are no cheats in patapon 2; either you get a software hack system or alter the game (Only for game programmers)There are only tips and tricks, not cheats
defeat manboth in lvl.3