Metal Gear Solid: Portable Ops Plus - Cheats (PSP)

Unlock Arms Magazine Soldier
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Password - Unlockable Character Passwords
Enter the password in the “Recruit” “Password” section of the main game menu.

Unlock special characters.
Naked Snake : Beat easy mode in infinity mission.
Old Snake : Beat Medium mode in infinity mission.
Raiden : Beat hard mode in infinity mission.
Roy Cambell : Beat extreme in infinity mission.