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Playstation - Parasite Eve cheats

Track the helicopter
Push the Select button at the city map screen to track the helicopter.

Get bonus ammo
Go back to the police station, then enter to the weapon storage room.
You will find 30 bullets inside the box. You can repeat this 10 times 
during the game.

Get Bonus points
Finish one day without saving the game to get bonus points on the nex day.

Unlock EX Game mode
Finish the entire game once to unlock the new Ex Game mode option