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Playstation 2 - Guilty Gear X cheats

Unlock Testament and Dizzy fighters in all game modes
Press Down, Right, Right, Up, Start, on the "Press Start" screen, 

Unlock Testament as playable character:
Finish the arcade mode once or get level 20 in survival mode.
You have to beat Testament also.

Unlock Dizzy  as playable character:
Get level 30 in survival mode and beat Dizzy

Unlock Guilty Gear mode options:
Reach level 100 in survival mode and beat the last enemy.