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There are many features that can be unlocked in the game.

Stealth Camo[edit]

In order to unlock the Stealth Camo, you need to attain a Tech level of 99.

Gameplay[edit]

Extreme Difficulty[edit]

In order to unlock the Extreme Difficulty, you need to beat the game once.

Boss Rush (EU only)[edit]

In order to unlock the Boss Rush mode, you need to beat the game once.

Characters[edit]

Name Unlocking Code (NA) Code (EU)
Cunningham Beat Cunningham on any difficulty by Stamina kill and beat the game before January 1st 1971. JUNKER CUN=BOA
Elisa In order to unlock Elisa you need to reach a Lvl 80 Medic Unit (unlocking Elisa prevents you from unlocking Ursula). THE-L E.WASP
EVA When you receive a report from the Guest House about a Government Official, head to this place and interrogate the Gov. Official twice (he's in a room at the first floor of the second building when you start). Then head to the Security Base and enter the building farthest from you to open some lockers and get a frequency: 142.52. Then head to the Comm Base where you will call EVA, she will arrive a week later. Then wait a few days, then head to the Airport (you must go there between 5 to 8 days), but don't wait too long or you'll miss her forever! After this you must wait for the report EVA Sighted, and then head to Western Wilderness. E.APPLE 016K/HYH
Gako Soldier He is only unlockable via Cheat Codes !TRAUMER GAK.O
Gene
  • (NA) Recruit a cumulative number of 200 soldiers on one save and beat Gene by Stamina kill.
  • (EU) Complete Boss Rush mode.
ERBE 9-VIPER
NULL Deplete either of his Health/Stamina bars in each fight, and complete the game. Hunter-n ALL=0
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. R.R.R. THE-SON
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). PM-EMS E.M.S.
Python Beat him by Stamina kill when confronting him. LQ.N2 GUFO
Raikov As soon as you discover the location of the Guest House, put spies in Town, if you already had spies in Town, you might have received the report Map Found, if not, do so and wait. You must do the mission associated with the report as soon as you receive it, or else you won't be able to recruit Raikov! When you have the report, head to the Town and locate the Secret Document in a building to the north. When it's done, place a spy in the Western Wilderness. When Snake is free from his prison, you will receive another report from Western Wilderness mentioning a "Handsome Soviet Major", go save him, you just need to reach the building in front of you when you start, then go down a ladder inside the room, then head down, his cell is opened. IVN =RV SKAZKA
Sigint After Snake is rescued, go to the Comm Base and call him from the Radio Room. A few days later, a report from the Town (put spies in the Town) allows to recruit Sigint by rejoining him without any alert. DARPA-1 D+ARPA
Sokolov After Snake is rescued, put a spy in the Harbor, you will receive a report. Head to the Harbor and go to the ship's hold to receive a call. Later, after you've defeated NULL for the second time, and after you've unlock the Silo Complex location, you will need to head to the Power Substation again, and find a Soviet Officer (in the building) to interrogate. He will give you a frequency: 145.61

Head back to the Silo Entrance to find a locked door (near where you encountered NULL the first time, also next to where you had to go when there was a 5:00 timer), call the frequency on the radio then enter and retrieve the Saturn V Documents. You will then receive a report from the Plant, go there and retrieve Sokolov.

SATURNV Vostok
Teliko Have a Metal Gear Ac!d save on your memory stick, and start a new game on an already completed save. T.F-ACID SHINE!
Ursula In order to unlock Ursula you need to reach a Medic Unit level superior to 80 with the number finishing with an even digit (unlocking Ursula prevents you from unlocking Elisa). PK+ESP ESP:ASP
Venus Have a Metal Gear Ac!d 2 save on your memory stick, and start a new game on an already completed save. MGA2VE @VESPER
Zero Have a Metal Gear Solid: Digital Novel save on your memory stick, and start a new game on an already completed save. 1+2-3 GALAXY-0