Guilty Gear X
Hidden fighters:
Press Down, Right(2), Up, Start at the "Press Start" screen to
unlock Testament and Dizzy in all game modes. Alternately, successfully
complete the game in arcade mode or reach level 20 in survival mode then
defeat Testament. Reach level 30 in survival mode and defeat Dizzy to unlock
her in all modes.
Guilty Gear mode:
Reach level 100 in survival mode and defeat the last opponent to unlock
the Guilty Gear mode option.
Alternate costumes:
Hold Start, Triangle, or X when selecting a fighter at the character selection
screen to choose three alternate costume colors.
Hint: Special attack:
Press Triangle + Square during a match as any character.