There are many features that can be unlocked in the game.
Stealth Camo
In order to unlock the Stealth Camo, you need to attain a Tech level of 99.
Gameplay
Extreme Difficulty
In order to unlock the Extreme Difficulty, you need to beat the game once.
Boss Rush (EU only)
In order to unlock the Boss Rush mode, you need to beat the game once.
Characters
| Name | How | Cheat Code |
|---|---|---|
| Cunningham |
Beat Cunningham on any difficulty by Stamina kill and beat the game before January 1st 1971. |
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| Elisa | ||
| EVA | ||
| Gako Soldier | He is only unlockable via Cheat Codes |
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| Gene |
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| NULL |
Deplete either of his Health/Stamina bars in each fight, and complete the game. |
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| Ocelot |
Recruit Sokolov, then head to the Silo Entrance and interrogate the Soviet Officer located on top of the bridge area. Wait until you receive a Spy Report from the Town. Head to the Town at nightfall and locate the Government Official in one of the upper buildings, then interrogate him. Head to the Airport and interrogate the FOX soldier at the control deck in order to learn a radio frequency: 141.23. Recruit EVA. Head to the Ravine and infiltrate its communication building. To do so, find the Key located on the second level of a nearby cave. Enter the building and contact the frequency (141.23). After the call, complete the game. |
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| Para-Medic | First retrieve the Malaria medication (story-based) and then head to the Comm Base, contact Para-Medic in the Comm room. She will arrive 3 days later (put spies in the Hospital to receive a report. |
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| Python | ||
| Raikov | ||
| Sigint | ||
| Sokolov | ||
| Teliko |
Have a Metal Gear Ac!d save on your memory stick, and start a new game on an already completed save. |
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| Ursula | ||
| Venus |
Have a Metal Gear Ac!d 2 save on your memory stick, and start a new game on an already completed save. |
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| Zero |
Have a Metal Gear Solid: Digital Novel save on your memory stick, and start a new game on an already completed save. |
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