Unlockable Characters
Unlock Lieutnant Cunningham:
On any difficulty defeat Cunningham by 'Stamina Kill' and beat the game before January 1st 1971. Cunningham will then be unlocked when you make a new game.
Unlock Null:
Defeat Null twice by either 'Stamina kill' or 'HP kill' and then beat the game. Null will then be unlocked when you make a new game.
Unlock Para Medic:
On the Comm Tower stage contact her on the radio then later in the Hospital stage rescue her. Place spies in the Hospital.
Unlock Raikov:
Place spies in Western Wilderness then clear the Guard House mission. You will then get a report of a prisoner being held there.
Unlock Sigint:
When Snake has been captured and rescued you can contact Sigint on the radio at the Comm stage then rescue him in the town.
Unlock Major Zero:
Have a Metal Gear Solid :DGN game save on your PSP's Memory Stick (Second Playthrough only).
Unlock Teliko:
Have a MGA game save on your PSP's Memory Stick. (Second Playthrough only)
Unlock Venus:
Have a MGA 2 game save on your PSP's Memory Stick. (Second Playthrough only)
Unlock Gene:
In one playthrough recruit 200 soldiers and 'Stamina' kill Gene.
Unlock Sokolov:
Give the Saturn V blueprints to Sokolov
Unlock Python:
Kill Python by 'Stamina kill'.
Unlock Elza:
Get a Medic level of 80.
More tricks, tips and cheats for this game are right here - Metal Gear Solid: Portable Ops cheats
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