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Playstation 2 - Z.O.E.: Zone Of The Enders cheats

Maximum health and ammo
Pause the game play and enter L1, L1, L2, L2, L1, R1, L1, R1, R2, R1.
Note: Every time you activate this cheat, you will get a penalty

Unlock Versus mode
Go to the title screen, then enter 
Circle, X, Right, Left, Right, Left, Down, Down, Up, Up.
or
Finish the game on any difficulty level

Two more stage:
Finish the game on any difficulty level two times

Alternate ending music
Finish the game on any difficulty level and reach an "A" rank in 
all 5 SOS mission.