Guilty Gear X - Platform: Playstation 2

Hidden fighters:
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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:
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Reach level 100 in survival mode and defeat the last opponent to unlock the
Guilty Gear mode option.
Alternately, unlock Testament and Dizzy then successfully complete arcade
mode without losing any rounds with the time option set at 60 seconds. 
This may be done with any difficulty and round number setting.

Alternate costumes:
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Hold Start, Triangle, or X when selecting a fighter at the character
selection screen to choose three alternate costume colors.

Mecha Ky:
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Select Guilty Gear mode and choose Ky at the character selection screen.

Special attack:
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Press Triangle + Square during a match as any character.

Ki Kiske:
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After gaining Guilty Gear mode, Ki Kiske is the only one truly affected. He
trips over his words, crawls on the ground, gains a new attack and alters 
two attacks. The Down, Back + X and Down, Forward + Circle attacks are 
different. Also, press Forward, Down, Forward + Circle with half a limit 
bar, he does his combo attack upwards.

Enable Bosses and Hard Mode:
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At the Arc Logo, press Down + Square + L1 + R2. Hold the buttons until 'Team
Neo Blood' disappears. Baiken, Testament and Justice are now playable in Vs. 
Mode.

Chip's Infinite Combo:
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Chip has an incredibly cheap, yet easy to do infinite combo - simply do his
uppercut, then, right before the opponent lands, dash in, and do another one. 
Repeat.

Play as Baiken:
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To get Baiken, beat the normal mode without continuing.