In the fight with The Sorrow, go to your backpack and take out your camera and take pictures of all The Bosses, including Th Sorrow's Dead body, when you look at it, you will see the faces of the Game Developers.
At the end, when you do the quick draw with Ocelot. Pick the gun on the left, when you can shoot do not shoot at all. A hidden cutscene will happen with Ocelot talking about why you didn't shoot the gun.
When you are in the woods with Eva, shoot her with the tranquilizer gun. Walk right up to her while she is asleep (you may have to crouch). She will begin saying interesting things in her sleep.
In the Snake Eater Mission, go to compound area where the Hind sits. You'll know it's the right area because you'll see the Hind (Helicopter) grounded with noone piloting it. Interrogate the guard closest to the front door entrance of the largest building two or three times and he'll give you a password for Metal Gear Acid: V I P E R (Viper).
Its the guard you see on the second floor, when you first enter Groznyj Grad Weapons Lab: East Wing. Interrogate him to get the Acid... Password... X M E I G H T.
While traveling with EVA, grab her, and interrogate her. She'll tell you a code that involves directions but then she'll say that she doesn't remember the rest of it. The code EVA was talking about was the famous 30 lives cheat code from Contra on the NES.
| Alligator - Any Difficulty | 81-249 Alerts, 41 or more Continues, 101-299 Kills |
| Bat - Normal Ranking | No Alerts |
| Capybara - Normal Ranking | Play Time over 30 hours |
| Cat - Easy and Very Easy Ranking | Save over 100 times |
| Centipede - Any Difficulty | 1-20 Alerts, 41 or more continues, 1-100 kills |
| Chicken - Easy and Very Easy Difficulties | Alert Mode over 300 times, Kill over 300 people, Eat more than 31 Meals, Play Time over 30 hours, Continue over 60 times, Save over 100 times |
| Cow - Special Ranking | Alert Mode raised over 300 times |
| Crocodile - Any Difficulty | 81-249 Alerts, 0-40 Continues, 101-299 Kills |
| Deer - Normal Ranking | Save over 100 times |
| Doberman - Extreme Ranking | No Special Item used, 1 Alert, 0 Kills, Under 3 Life Meds, Under 5:15 play time, 0 continues |
| Doberman - Hard Ranking | No Special Item used, 0 Alerts, 0 Kills, 0 Life Meds, Under 5:00 play time, under 50 saves, 0 continues |
| Doberman - Normal Ranking | No Special Item used, 0 Alerts, Under 10 Life Bars of Damage, 0 Kills, 0 Life Meds, Under 5:00 play time, under 25 saves, 0 continues |
| Eagle - Extreme Ranking | Play Time under 5:00 |
| Elephant - Normal Ranking | Over 31 Meals Eaten |
| Falcon - Normal Ranking | Play Time under 5:00 |
| Flying Fox - Hard Ranking | No Alerts |
| Flying Squirrel - Easy and Very Easy Ranking | No Alerts |
| Fox - Extreme Ranking | No Special Item used, 0 Alerts, 0 Kills, 0 Life Meds, Under 5:00 play time, under 50 saves, 0 continues |
| Fox - Hard Ranking | No Special Item used, 0 Alerts, Under 10 Life Bars of Damage, 0 Kills, 0 Life Meds, Under 5:00 play time, under 25 saves, 0 continues |
| Foxhound - Extreme Ranking | No Special Item used, 0 Alerts, Under 10 Life Bars of Damage, 0 Kills, 0 Life Meds, Under 5:00 play time, under 25 saves, 0 continues |
| Giant Panda - Extreme Ranking | Play Time over 30 hours |
| Hawk - Hard Ranking | Play Time under 5:00 |
| Hippopotamus - Extreme Ranking | Save over 100 times |
| Hound - Easy Ranking | No Special Item used, 0 Alerts, Under 10 Life Bars of Damage, 0 Kills, 0 Life Meds, Under 5:00 play time, under 25 saves, 0 continues |
| Hound - Extreme Ranking | No Special Item used, 2 Alerts, 0 Kills, Under 5:00 play time, under 25 saves, 0 continues |
| Hound - Hard Ranking | No Special Item used, 1 Alert, 0 Kills, Under 3 Life Meds, Under 5:15 play time, 0 continues |
| Hound - Normal Ranking | No Special Item used, 0 Alerts, 0 Kills, 0 Life Meds, Under 5:00 play time, under 50 saves, 0 continues |
| Hyena - Any Difficulty | 51-80 Alerts, 41 or more Continues, 101-299 Kills |
| Iguana - Any Difficulty | 81-249 Alerts, 0-40 Continues, 1-100 Kills |
| Jackal - Any Difficulty | 51-80 Alerts, 0-40 Continues, 1-100 Kills |
| Jaguar - Any Difficulty | 21-50 Alerts, 0-40 Continues, 1-100 Kills |
| Kerotan - Special Ranking | Shoot all 64 Kerotan Frogs |
| Koala - Easy and Very Easy Ranking | Play Time over 30 hours |
| Komodo Dragon - Any Difficulty | 81-249 Alerts, 41 or more Continues, 1-100 Kills |
| Leech - Special Ranking | Clear the Game with Leech attached |
| Leopard - Any Difficulty | 21-50 Alerts, 41 or more Continues, 1-100 Kills |
| Mammoth - Hard Ranking | Kill over 300 Humans |
| Markhor - Special Ranking | Every Plant and Animal Captured, Cure Supply Plant, and non animal-plant item (RC Mate, Noodles, etc.) |
| Mongoose - Any Difficulty | 51-80 Alerts, 41 or more Continues, 1-100 Kills |
| Mouse - Normal Difficulty | Alert Mode over 300 times, Kill over 300 people, Eat more than 31 Meals, Play Time over 30 hours, Continue over 60 times, Save over 100 times |
| Night Owl - Extreme Ranking | No Alerts |
| Orca - Extreme Ranking | Kill 250 or more Humans |
| Ostrich - Extreme Difficulty | Alert Mode over 300 times, Kill over 300 people, Eat more than 31 Meals, Play Time over 30 hours, Continue over 60 times, Save over 100 times |
| Panther - Any Difficulty | 21-50 Alerts, 0-40 Continues, 101-299 Kills |
| Pig - Easy and Very Easy Ranking | Over 31 Meals Eaten |
| Pigeon - Special Ranking | No Kills |
| Piranha - Easy and Very Easy Ranking | Kill over 300 Humans |
| Puma - Any Difficulty | 21-50 Alerts, 41 or more Continues, 101-299 Kills |
| Rabbit - Hard Difficulty | Alert Mode over 300 times, Kill over 300 people, Eat more than 31 Meals, Play Time over 30 hours, Continue over 60 times, Save over 100 times |
| Scorpion - Any Difficulty | 1-20 Alerts, 0-40 continues, 1-100 kills |
| Shark - Normal Ranking | Kill over 300 Humans |
| Sloth - Hard Ranking | Play Time over 30 hours |
| Spider - Any Difficulty | 1-20 Alerts, 41 or more continues, 101-299 kills |
| Swallow - Easy and Very Easy Ranking | Play Time under 5:00 |
| Tarantula - Any Difficulty | 1-20 Alerts, 0-40 continues, 101-299 kills |
| Tasmanian Devil - Any Difficulty | 51-80 Alerts, 0-40 Continues, 101-299 Kills |
| Tsuchinoko - Special Ranking | Clear game with living Tsuchinoko captured |
| Whale - Extreme Ranking | Kill over 300 Humans |
| Zebra - Hard Ranking | Save over 100 times |
| Peep Show Movie. | Collect all the Movies in Demo Theatre. |
| Unlockable | How to Unlock |
|---|---|
| Camo Chocolate Chip | Bolshaya Past South. |
| Camo Ga-Ko | Chyornyj Prud, underwater in northeast. |
| Camo Grenade | Download it to your memory card. |
| Camo Mummy | Download it to your memory card. |
| Camo Rain Drop | Dremuchij North, under the rope bridge on the far side. |
| Camo Santa | Download it to your memory card. |
| Camo Snow | Peschera Cave, on the right branch before the Pain. |
| Camo Splitter | Bolshaya Past South. |
| Camo Valentine | Download it to your memory card. (JP and EU versions) |
| Camo Water | Bolshaya Past Base. |
| Facepaint Desert | Ponizovje Warehouse. |
| Facepaint Kabuki | Tikhogornyj, at the bottom of the pool before the waterfall. |
| Facepaint Oyama | Graniny Gorky Lab, Exterior. In the air duct. |
| Facepaint Snow | Bolshaya Past Base, In the fox hole on the left side of the middle building |
| Facepaint Water | After talking to Granin and fighting The Fear, go all the way back to the beginning of Ponizovje South. |
| Facepaint Zombie | Rassvet during snake eater mission. Behind the building. |
| Fly Camouflage | In the third bathroom stall on the second floor of the building where Granin is (it's locked so break the door down). |
| Infinity Face Paint | Beat the game with the Foxhound Rank |
| Infinity Face Paint (alternate method) | Catch a live Tsuchinoko before torture scene. After you get your weapons, go back and capture it again just outside. Finish the game with it alive. |
| Monkey Mask | Complete every level in Snake vs. Monkeys |
| Spirit camouflage | Last all the way through Sorrow's river |
| Uniform Maintenance | Groznyj Grad Weapons Lab: East Wing in locker. Same time as the Sneaking Suit. |
| Uniform Officer | Steal it from Raikov. |
| Uniform Scientist | Given to you by Eva. |
| Uniform Sneaking Suit | Groznyj Grad Weapons Lab: East Wing. In the locker with the red stripe. |
| Banana Camouflage | Get the highest record time in every stage of Snake vs. Monkey |
| Colt Single Action Army | Choose the gun on the right during the final duel. |
| Extreme Difficulty Mode | Complete the game once |
| Intro movie on title screen | Complete Virtuous Mission |
| Mechanic Uniform | In Second Locker on Far Right in Groznjy Grad (Near the locker where you put Major Raikov at) |
| Mosin Nagant | Defeat The End/MK22 only |
| Moss Camo | Defeat The End by sneaking up behind him during battle and pointing a gun at him. He will lay on the ground. Point the gun at his head three times, aiming elsewhere when he speaks. |
| Patriot | Complete the game once |
| Snake vs. Monkey levels 4 and 5 | Complete the game once |
| Sneaking Suit | In Locker you put Major Raikov in (Second time you go to Groznjy Grad) |
| Stealth Camouflage | Find and shoot all 64 Kerotan frogs that are scatter through out the whole game. |
| Stealth Camouflage (alternate method) | Beat the game with no alerts |
| Tuxedo Camouflage | Complete the game once |
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