When entering "Graniny Gorki Lab, 1F" (An area in which you must wear the scientist disguise), interrogate the first guard you see in the lobby. The 3rd time you interrogate him, he'll reveal a password for Metal Gear Acid: "J E H U T Y"

In the office of Granin, there are models of things from other games Hideo Kojima Made. There is a model of Metal Gear Rex from Metal Gear Solid 1, A model of Metal Gear Ray from metal gear solid 2, and a model of Jehuty from Zone of the enders 1 and/or 2.

After the cut scene where you first meet Ocelot, knife (or shoot if you have the Patriot) him to death. Once you kill him the game over screen will pop-up and say "OCELOT IS DEAD." Cambell will then yell at Snake for creating a time paradox.

At three points during the ending, you can hold R1 to look around in first person. It is not indicated that you can use R1 but it's there. There are some small hidden things that can only be seen this way.

After beating the game once, Snake will have an eyepatch on during the CQC fights he has with the Russian guard at the title screen.

When beginning a new game you are prompted with three questions:
"This is my first MGS game"
"I like MGS1"
"I like MGS2"
Selecting this is my first MGS game has the regular opening. Selecting I like MGS1 makes your stamina drop slower. Selecting I like MGS2 gets you a special intro.

Similar to making Snake spew, when you're escorting Eva to the lake, go into the cure option in the Survival Viewer to look at Eva and then use the analog sticks to spin her around several times. When you resume gameplay, Eva will vomit. Repeat this enough times and she will complain about stomach cramps and say other funny comments but this will also diminish her stamina quicker.

At the end of Virtious Mission, Hold R1 in the cutscene after Snake has healed himself. You will be able to look around when it is not indicated that you can and you can see The Sorrow's body.

After you've climbed the mountain, hold R1 during the cutscene where Snake is spying on Volgin on the base. You can see The Boss ride off on her horse and EVA do the "handgesture".

After being tortured, hold R1 as Ocelot leaves the room. The Boss does the "handgesture".

After defeating the Shagohod, hold R1 and when EVA goes to hug Snake you can see The Sorrow behind her.

After defeating The Boss, when her horse walks up, hold R1. You can see the ghosts of The Boss and The Sorrow.

When the President goes to shake Snake's hand, hold R1 and look to the left. Ocelot is outside the window.

When Snake is at the graveyard, hold R1. His eye tears up and you can't see much.

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 obtaining the uniform from Raikov, the guy who looks and attacks like Raiden, shoot him in the crotch to kill him. During your battle with The Sorrow, a naked raiden will walf down the river hiding his privates, complete with bluring.

After your meeting with Granin, his door will become locked to you but you can still listen to him inside his office. After a few minutes he will start mumbling some curious things while half asleep.

During the cut-scene when Snake stuffs Major Raikov into the locker, on the door of the locker, there is a poster with a picture of Raiden and the text 'Metal Gear Solid 2' on it

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).

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.

During a cut scene, if you see the name of the character, the name in the parentheses is the voice actor. If you hit O, the name will change to the name of the character's motion capture actor.

If you look around in the military bases throughout the game (Groznyj Grad, Graniny Gorki, etc.) you can find several modern day gaming magazines on tables, including EGM, GMR, and a few others. Shoot these magazines with a weapon and they will open to a page about Snake Eater. Shoot them again and they will flip to the back cover.

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.

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?"

This guy is located in the back of groznyj grad main wing (The place with the shagohod). If you interrogate him he should say, "Metal Gear Acid password, K A R E N".

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.

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.

After caves and after the river with the guards on the hovercrafts, enter the next area and a cutscene will begin. As soon as the cutscene ends pull out your SVD sniper rifle and aim it at The End in his wheelchair. Before he gets taken away, shoot the guard in the head, then shoot The End in the head a few times. If done corectly The End will say something and explode. Later in the game when you get to the jungle where the fight was supposed to be, you wont have to fight him and the jungle will be filled with guards from the Ocelot unit.

When Snake is captured in the prison cell, do not eat the food the guard throws you. Instead, throw the food back out of the cell to the card. Continue to do this 2 more times for a total of 3 times and this will trigger a hidden cut scene.

After you escape from the cell, don't use Cure to take out the transmitter in your back. If the transmitter is in you when you meet up with Eva behind the waterfall, there will be an extra very funny scene where she takes it out of you.

In the cutscene that begins the battle against The End, his parrot flies away. Search the area using the Thermal Goggles and you will eventualy find a bird sitting in a tree or on a stump behind you. This is also a sign that The End is nearby. You can either kill the bird, which will trigger The End cursing your name and swearing revenge, or capture it. Either way the parrot still appears in the cutscene where The End dies. If you captured the bird, contact Para-Medic to have a conversation about the bird. It offers very little stamina but tastes good. If you killed or captured the bird, it also appears as a ghost during the battle against The Sorrow.

During the final battle with The Boss, equip the Thermal Goggles and search for 3 snakes in the field. These snakes are Snake Liquid, Snake Solid, and Snake Solidus. Anyone who has played 'Sons of Liberty' will notice that they are the names of the three 'Sons of Big Boss'. Each snake has a great taste and recovers a great amount of stamina.

After getting the hornet stripe camo (defeating The Pain via stamina kill) you have the ability to "tame" bees while wearing the hornet stripe uniform. Heres how you do it (while wearing hornet stripe camo): Shoot down a beehive while underneath it (or close enough to it so the bees fall NEAR you). The bees will then be swarming around you! Now go attack some enemys (or go near them) so they can feel the pain.

When you are in alert mode, grab a guard and interrogate him. He might give a radio frequency you can call to call off the alert. After the alert is over, the frequency changes.

At any time during a cut scene you can zoom in on the action by pressing the Triangle button. The harder you push it, the closer it zooms in. Also, while zoomed in you can pan the camera around using the left analog stick.

After so many calls, more "slideshow" images will open up for each person you talk to in your Codec. Each person has (at least) two additional personal information pages, usually accompanied by an interesting picture. To get this, call each person multiple times, after so many times, the images will open one at a time.

As demonstrated by Major Ocelot early in the game, the bullets on the Colt Single Action Army revolver are capable of ricocheting. Simply equip the SAA and fire at a non-volatile structure such as a rock formation, metal crate or wall and watch the bullet deflect off the surface. If mastered properly, this can be used to shoot enemies hiding behind structures or even around corners!

During the battle with Major Ocelot, if you unequip your current weapon and stand out in the open for a few seconds, there were be a secret cutscene where Ocelot accepts Snake's challenge for a quick-draw duel. Ocelot will then stand and face off against Snake and the game will automatically switch to First Person View. Quickly equip your weapon again and when you're ready, aim your weapon and fire! (The object of a quick draw duel is to draw your weapon first and fire but not cheat by drawing too early.)

Similar to the Quick Draw duel. When you meet Major Ocelot at Bolshaya Past Crevice, simply equip the Single Action Army revolver but instead of firing, use the R3 button (Right Analog Stick) to twirl your revolver repeatedly. In a secret scene, Ocelot will then confront you and also twirl his revolver to show off his freestyle twirling tricks. Depending on how you twirl your revolver, he will compliment or criticize you accordingly.

In the cave, bats attack you if you run. But if you use the active sonar and send out a 'ping', the bats will stop coming after you. That is because bats use sonar to see, they attack the strange noises snake is making and using the sonar tricks them into thinking you are just another bat.

Throughout the game, you will find several storehouses of food (Where you'll find items like Instant Noodles and Calorie Mates) and ammunition (Often where you find new weapons). If you have some TNT in your inventory, plant a piece inside a storehouse, stand back, and detonate it. You'll know the trick worked if the room becomes charred and black. If you do this to a food storehouse, enemies in the nearby screens will complain about their hunger, helping you detect them easily. If you destroy an ammo warehouse, guards will have only one clip of AK ammo, then they will switch to a pistol, and eventually they will have to use a knife.

Destroy a food storehouse and wait for the guards to start complaining about their hunger. Kill a poison animal (Such as a Poison Dart Frog) and equip it as a weapon. Throw it near a guard and he will eat it. In a few seconds he will collapse from the poison and die.

While fighting The End, climb a tree onto a ledge that is easily accessible to the old man. Lay down and take out your sniper rifle, go into first person, and search the trees, not necessarily looking for The End. You will eventually hear his footsteps behind you, but do not turn around. You will get a short cut scene where The End finds you and shoots you one with his rifle. Instead of killing you he says that you don't deserve to die that easily. He then proceeds to pick Snake up and carry him to the nearby jail where he will eventually awaken.

If you shoot The End with the SVD (sniper rifle) at the Ponizovje Docks, but DO NOT kill him (he'll wheel himself through the red door), he will start with less Health/Stamina when you fight him later in the game.

When fighting Col. Volgin throw a Russian glow cap and it will absorb his lightning attacks for a little bit.

When Snake gets puts in the jail cell. Save the game and turn the system off. Turn it back on and go to your saved game file. Load it and you will see a mini-game were you are this Zombie hunter guy and you can go around and kill zombies.

During your battle with The End, if you capture his parrot (use a tranquilizer pistol) and then set it free, the parrot will squawk and circle over The End’s head; revealing his sniper position and allowing you to shoot him. After you shoot him, The End will then relocate and you can recapture the parrot and repeat this method until The End is defeated. If you find it difficult to recapture the parrot, move to another Sokrovenno area and then return and the parrot should be perched at one of its usual spots. If you find it difficult to spot the parrot circling over The End, use your directional microphone and listen for The End scolding his [loud mouth] parrot.

When you enter the fighting area for the first time, save your game and quit. Go into the clock settings of your PS2 hardware and set the clock forward a couple of years. Load up the game and you will find that The End has died from old age!!

When dressing up as Major Raikov, you can get away with hitting enemies etc and they won't touch you. PLUS, you can also trigger the alert alarm by pressing triangle near one of the red alarm stations, this will send two or more guards to your area, where you can beat them unconscious and take any items they may be holding.

When fighting Volgin the first time you can wear the Ivan’s(Raiden's) mask and he will think you are the major and hesitate from attacking you. You will have a chance to shoot him a few times without him attacking. He will realize who you are after a while and become angry and attack more frequently.

While fighting The Fear, his main tactic is to jump from tree to tree in order to get the best shot possible on you. However, this depletes his stamina rather quickly, and like Snake, he needs to eat in order to keep himself going strong. As The Fear's stamina gauge decreases, he'll stop trying to attack you and begin using his crossbow to hunt for food instead. If he manages to catch enough of the local food sources, he will regenerate his stamina gauge; if you're a fan of scoring stamina kills on the bosses in order to get the secret uniforms in the game, The Fear's eating habits make it very difficult to deplete his stamina gauge in an honorable manner.

Thankfully, there is a cheap way to bypass the entire process. As soon as the battle starts, take poisoned pieces of food you have on stock and throw it into the middle of the area, then proceed to go on with the battle as you would normally. When The Fear's stamina gets low, he will cease to hunt for food and will instead go right for the food you threw out for him! Not only does this prevent The Fear's stamina from increasing, but it will actually decrease his stamina as well. Even better is that he'll stand there puking his guts up, which gives you all sorts of time to blast him with shots from your tranquilizer gun.

It should be noted that the best place to harvest poisoned food is in the very area in which you fight The Fear himself; you have to go through it en route to the science lab before fighting The Fear on the way back. The area is full of poison frogs and poison mushrooms, so make sure to stock up in advance. The more poisoned food you throw out at the beginning of the fight, the easier a time you'll have.

You can make yourself fall asleep by equiping the hankerchief, and wiping it in the air about 3 times. After the 3rd time "Z's" will appear above your head and you will collaspe!

Before you fight Volgin be sure to capture a living tree frog. When you are fighting him equip the tree frog as a weapon and throw it somewhere where volgin will see it. After he sees it he should say something then jump back he will then be vulnerable for a few seconds(until he kills the frog) allowing you time to get a few cheap shots in.

After destroying the food storehouse for Groznyj Grad, go to the bathroom stall that Raikov retreats to and drop some rotten food. Wait for Raikov to enter the stall and he will eat the food. The door will lock and Raikov will begin to experience some extreme bowel troubles! Knock on the door for some humorous dialogue.

At the part where you must carry EVA through the jungle, you can tranquilize her with the EZ gun, and she won't lose any stamina...therefore, saving you food for when you really need it.

Whenever the '!' or '?' icon appears above an enemy's head, and you shoot it, (this is tricky) the the guard appear to be intoxicated and have some white bubbles floating from his head, giving you a few seconds to either run away, or to attack the dazed guard.

When dealing with an enemy, shagohod mechanic, or scientist, make a noise and hide. Make sure you'll be able to see over the enemy's head. When a question mark comes over their head, shoot it. This will confuse the enemy for a short period of time by showing sparks fly out of their head and them stumbling around.

You can open all of the electronic doors that only open for Raikov by throwing a live captured animal in front of the doors to open them. When the animal crawls in front of the door, it will open allowing you to obtain the items before you get the Raikov uniform.

When you get into the cell after being tortured go into the survival viewer, and press R1 to look at snake closer. Spin Snake around in there for about 20 seconds, go back into the game and run for a little bit and Snake will spew. The guard will come in the cell asking whats wrong...knock him out and leave the cell.

When you have to face The Sorrow at the river, instead of following him, you simply crouch down on to the floor, and keep your head down and drown yourself. Then the usual cutscene will appear showing you escaping the battle.

When fighting Volgin, first phase, throw some man-made food (Calorie Mate, Rations, Instant Noodles, etc) to Ocelot, and Ocelot will give Life Recovery Medicine or SAA rounds in return!

Hold L2 during the entire torture sequence to not recieve any damage when Volgin punches you. It must remain held down until cutscene where he leaves otherwise any damage that would have been done is still dealt.

First equip the binoculars, then quick unequip.
Enter a tight space, like a vent, and as SOON as the camera begins to move into 'Intrusion Mode' aka First Person immediatly equip the binoculars. You will continue to move forward WITH the binoculars equiped, but you will not be able to control Snake at all, except to unequip the binoculars, which will then return everything to normal.

When fighting The Fear, before you beat him, let him hit you a few times with his crossbow. The bolts will stay in your body, and you are supposed to remove them through the Cure menu. If you beat him, you will automatically be healed fully, but the bolts will still be stuck in you for the rest of the game. If you go to your Cure menu, you will see them sticking out of you, but you can't remove them. They are visible with any camo you wear, but not visible during cutscenes.