Dragon Ball Z - Supersonic Warriors 2 - Platform: Nintendo DS

Maximum mode:
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Complete Z-Battle with any team to unlock Maximum mode. 

Hard Maximum mode:
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Complete Maximum mode on the Novice difficulty setting to unlock
the Hard difficulty setting in Maximum mode. 

Mania Maximum mode:
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Complete Maximum mode on the Hard difficulty setting to unlock 
the Mania difficulty setting in Maximum mode. 

Infinite Dragon Power:
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Complete Maximum mode on the Mania difficulty setting to get 
unlimited Dragon Power. 

Play as Android #16 and #17:
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Complete the 16's Agitation level in Android #18's storyline 
to unlock Android #16 and #17. 

Play as Android #18:
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Complete the Differences in Experience level in Krillin's storyline 
to unlock Android #18.