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Sony PSP - Ghost In The Shell: Stand Alone Complex cheats

Unlock a movie viewer option and a mini-game
Finish the game once.

Weapon extras:
Finish a level with only a handgun. 
When you reach the level end, you will get the dual wield handgun. 
You can equip yourself both of the guns in only one weapon slot.

Finish all the single player mode stages with a character.
This will unlock his custom weapon. 
The unlocked weapons can be used by any other character.