Rockman Zero – Gameboy Advance

Rockman Zero - Platform: Gameboy Advance

Unlock Hard Mode
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Beat the game, then hold L when starting a new game. 

Unlock Jackson
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Beat the game in Hard Mode with an A or S rank, then use 
the saved game when starting a new game to unlock Jackson. 

Unlock Ultimate Mode
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Start a game with Jackson. Beat the game using all elves then, 
when starting a new game, hold R to unlock Ultimate Mode.