After being captured and waking up in the cell, throw back the food 3 times to see the scene where the soldier tells you his and his sons name (Johnny). Now wait a few minutes, Johnny will bend over, hold his stomach and will then run to the toilet. As a bonus, he will say some hilarious sentences like "Wow, that's a record!" or "Will that even flush?"
During the intro scene for Operation Snake Eater, you have the opportunity to press R1 to view part of the scene through Snake's view (the interior of the cockpit). When you do so, if you look all the way up (past all the instruments), you'll be able to see a poster of Yumi Kikuchi, a Japanese voice actress who had parts in Comic Party, Mahoromatic, Kakyuusei, and other shows.
After Volgin leaves the room after torturing you, Snake and Eva will be alone when the R1 button is prompted you can see some one behind with a board and a Codec number writen on it when your in the Cell call it and It will say "The door is open now".
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 |
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