To unlock Curse seal Sasuke complete the C rank mission DECENT INTO DARKNESS
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Try Sasuke Tayuya and Naruto(S)
team 7- naruto, sasuke, sakura or... sasuke, dosu and tayuya this is what i think
there are no cheats on naruto arena to unlock all characters figer this out
sakura is already unlocked...
win 15 battles with lee,tenten,neji