Guilty Gear X - Gameboy Advance
Unlock Testament:
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Defeat Testament when he challenges you in stage 9.
Unlock Dizzy:
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Defeat Dizzy when she challenges you in stage 10.
Original mode:
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Successfully complete the game in survival mode to unlock the
Original Mode selection at the options screen.
Extra mode:
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Defeat a fighter's dare devil version in survival mode to unlock
extra mode for that fighter. The fighter's extra version is able
to execute new moves and supers.
Fight as Dizzy or Testament:
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Press Down, Right(2), Up, Start at the Press Start screen.
Alternate costumes:
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Press Start or Select when choosing a fighter at the character
selection screen.
Guilty Gear mode:
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Select survival mode. Get to stage 180, then continue on and defeat
all opponents until reaching stage 330. The Guilty Gear versions
will now be unlocked.