Cheat Codes:
Start the game with the mgsi.exe -cheatenable command line. Then, press one of the following keys during game play to activate the corresponding cheat:

CHEAT FUNCTION – CHEAT CODE
Restore energy, only at certain points (God mode) – [F2]
Unlimited ammunition, only at certain points – [F4]
Return to normal view from observe mode – [F5]
Observe mode; camera can be moved throughout level – [F6]
Immediately restart level with all items already collected – [F7]
Toggle alternate graphics textures – [F8]
Toggle alternate graphics textures – [F9]
Toggle alternate graphics textures – [F11]
Toggle alternate graphics textures – [F12]
Spawn C4 – [Backspace] 7
Spawn Claymore – [Backspace] 6
Spawn FAMAS – [Backspace] 2
Spawn Grenade – [Backspace] 3
Spawn Nikita – [Backspace] 4
Spawn PSG-1 – [Backspace] 0
Spawn Socom – [Backspace] 1
Spawn Stinger – [Backspace] 5
Spawn Stun/Chaff Grenade – [Backspace] 8 or 9

MP5-SD weapon:

Hold [Alt] [Ctrl] at the skill level menu. A MP5-SD will appear in a weapon slot. Note: You cannot get the Famas during game play if this weapon is present.

Technical demonstration mode:

Successfully complete the following modes in order “Training”, “Time Trial”, “Gun Shooting”, “Survival”. Note: Completing each mode will unlock the next mode in the sequence. “Technical demonstration” mode will now be unlocked. Use it to watch the CPU demonstrate its best time with the gun.

Alternate costumes:
Successfully complete the game, wait until the credits end, and save the game. Load the saved game file and play through the game again. After successfully completing the game a second time, wait until the credits end, and save the game. Load the saved game and play through the game again. Snake will change into a tuxedo in the elevator during this game.

Alternate ending and music:

Successfully complete the game with the Tuxedo costume.

Stealth gear:

Successfully complete the game under the easy difficulty level after submitting during the torture. Otacon will give your character the stealth gear after being saved. Allow the credits to complete, then save the game. Load the saved game to begin with the stealth gear.

Bandana:
Successfully complete the game without submitting to the torture. Your character will save Meryl and receive the Bandana. When equipped, the bandana will allow unlimited ammunition on any weapon.

Stealth gear and Bandana:

Use the following steps to get both the Stealth Gear and Bandana. When you complete the game by not submitting to the torture, you will only get the bandana. Simply submit to the torture to get both items.

Development team photos:
Use the camera to take pictures at the following locations:

NAME – LOCATION
Fujimura – Elevator in the Comm Tower B complex
Fukushima – Heliport; looking out to sea from cliff
Hirano – Elevator in Comm Tower B; deep in the shaft of top level
Ishiyama – Heliport top of building
Ito – Inside elevator to tank hangar
Jerem Blaustein – Sniper Wolf’s corpse
Kaneda – The mirror located in the Women’s restroom
Kimura – MG underground base; tip of Metal Gear ‘s railgun
Kinbara – Dark area of stairs
Kitao – Decoy Octopus (fake DARPA chief) corpse
Kobayashi – Rock in canyon
Kobayashi – Johnny Sasaki holding cell, near DARPA chief
Kojima – Otacon lab; the picture frame to the right
Korekado – Men’s restroom
Kozyou – Behind the watertank-like structure in the Canyon
Kutome – Observation room
Makimura – Hidden armory store room; behind the weakened wall
Matsuhana – Hallway of corpses; outside Otacons lab
Mizutani – When fighting Metal Gear
Mori – Lowest point of elevator; Comm Tower B
Mukaide – Reflection in wolfdog cave puddle
Muraoka – Water in cargo dock
Nakamura – In Meryl’s blood pool; where she is sniped
Negishi – Sewage waterfall
Nishimura – Next to Baker’s corpse
Okajima – Maggots of the real DARPA Chef in cell
Onoda – Where Baker is tied up
Sasaki – Picture frames in the Commander’s room
Sato – Comm Tower A; roof destroyed by Hind D missiles
Scott Dolph – Deep down in the dark from the walkway between Comm Towers A and B
Shigeno – Heliport,security caera by staircase
Shikama – Electric floor
Shimizu – Wolf dog cave; first crawling point
Shinkawa – Deep in Sniper Wolf’s hallway behind the second pillar
Sonoyama – Torture machine
Takade – Ninja room; glass atedga
Tanaka – Heliport; sleeping soldier
Tougo – End of boiler room; in Blast Furnace with the steam
Toyota – Container in the middle of Raven’s warehouse
Uehara – Edge of elevator; where the ravens are
Yamashita – Tip of nuke warhead in nuke storage room
Yoshimura – Dead end of air duct
Yoshioka – Bridge on the third floor of the blast furnace

Go to the south building on basement 1. When you exit the elevator, go to your left and enter the bathroom. You will see a soldier using the facilities. Take a picture of him from the left angle. When the picture is developed, you will see the director on the soldier.

Camera:
Reach area B2 of the tank hanger. At the end of the hallway to the right of the door where you fight revolver is a secret room that is entered after using C4 explosive. In the room are card 4 and card 6 doors. The camera is in the room behind the card 4 door. Use the camera to take pictures to see various extras, such as the faces of the development team.

Easy camera use:
Get the camera and the stealth suit to take photos very easily. Wear the stealth suit, go near an enemy, then use the camera close-up in his face. He will probably see you, so use stealth again.

Camera tricks:
Once you get the digital camera, go back to where the DARPA chief (Decoy Octopus) died. If his body is still there, take a picture of it then save the game. Restart the PlayStation and select “Special” at the main menu. Select “Photos” and play around with the red, green, and blue. Eventually, you will reveal Decoy Octopus. This also works with Meryl. Take a picture of her just before you enter the room to fight Psycho Mantis, and immediately after she begins to act strange. Then use the same steps done to reveal Decoy Octopus and you will reveal Psycho Mantis, Meryl’s possessor. Note: If the DARPA chief’s (Decoy Octopus’) body is not in the cell when you return with the camera, do not worry. Play through the game then start a new game from the same save file. The camera will now already be in your inventory.

Using boxes to save time:
Equip a box in the various game areas to travel to the destination on the boxes and easily skip areas. The boxes can be found:

In Tank Hangar level 1, on the top floor, in the room by the stairs.
In the Arms Storage building basement 1, in one of the rooms inside the main room on that floor.

In one of the storage rooms in the courtyard where the second confrontation with Sniper Wolf took place.

To use the boxes (A, B, or C), jump in the back of one of the trucks found in each area and hide in the box. Eventually a soldier will notice and drive Snake to the destination labeled on the box:

-The Heliport
-The Arms Storage Building
-The Field (where Sniper Wolf was killed)

This trick can be used to save time traveling between buildings, and also keeps Snake from being in the cold for extended periods of time (preventing the sneezing and sniffles that alert the guards to his presence).

Use a box to return to the heliport:

Once in the Tank Hanger, after you go to the DARPA Chief, you will receive a level one keycard. Go into the Tank Hanger and climb up the stairs by the surveillance camera. There should be a door by the camera. Use the level one keycard to get inside. Find the cardboard box marked with “To Heliport”. You can use the box in the missile hanger by getting into the back of the truck in back of the hanger. It will take you back to the heliport.

When to avoid boxes:

If you have been spotted, do not hide in a box because the guard will think that you are inside it.

Box tricks:
Hit Meryl, then retreat into your box. She will say something and kick you while in the box.

Go into your box when you know an enemy is coming without letting him see you do this or move while in the box. Some guards say, “Ah, Mr. Box” and will leave. Others will say, “Ah, Mr. Box” and will sit there for awhile before yelling “Get out of the way!” and kicking the box off of you.

Codec numbers:

Use all these frequencies to contact people in the Codec.

Roy Campbell and Doctor Naomi Hunter: 140.85 (to back up Snake)
Mei Ling: 140.96
Nastassia Romanenko: 141.52 (Nuclear specialist. Provides healthy information on using weapons)
Master Miller: 141.80 (Provides psychological information and advice. Reveals information on Naomi at the end of the game)
Otacon (Dr. Hal Emmerich): 141.12 (Provides advice on beating Metal Gear)
“Deepthroat”: 140.48 (Unknown. Later revealed at the end of the game)

Cold Medicine:
In B1 of the nuclear warhead storage, go to the office (down) and to the left walkway. The second door down requires a Level 6 security card and contains the cold medicine. Note: You only get a cold if you submit to Ocelot’s torture.

Body Armor:
On the Disc 1 when you have escape through the cell by hiding under the bed after Otacon gives you some items, return to the room where you had to use the Nikita Missiles and the Gasmask. Use the Level 6 Card to search around to get the Body Armor and many other items. Watch out for surveillance cameras and search all the rooms that you have not visited yet.

Early SOCOM:
After you crawl through the vent and enter the tank room, go past the elevator. Go up the stairs, take a left, and follow it all the way until you reach a door. Go through it and you will find a SOCOM in that room.

Thermal Goggles:
After sneaking on the cargo elevator, you will see a helicopter pad. Behind that is a truck. Get in the back of the truck and you will pick up a pistol. Go to the Tank Hangar, and you will be able to get thermal goggles at the location that you would normally find a pistol.

Items through Level 6 Card:
When you get the Level 6 Card, head towards the Comms. Tower (directly next to the caves) as you are supposed to. However, when you are on B1, go to the room just in front of the elevator. Use the Level 6 Card to get extra items. You can also use it in the Armory.

Extra rations:
Before the second battle against Sniper Wolf, over the right side of the wall is a ration. Then go out to the blizzard. When the battle begins there will be another ration at that same location.

When the game begins, Snake has to go under something to get to the elevator. Do not do this. Instead, go down the stairs, back into the water. There will be a platform with a crate. There is a ration behind the crate.

Thawed rations:
If your rations are frozen, walk up to the hand dryer in the bathrooms to thaw. Do not let the guard hear you. If you can, shoot him with a SOCOM (supressor is required) to earn a ration.

An additional way to thaw frozen rations are to equip them.

An additional way is to take a trip to the blast furnace.

Annoy Cambell:

Snipe the rats above where you first encounter Wolf or snipe the ravens when at your second encounter with Raven.

Avoid DARPA Chief rescue:

When you get inside the building and reach the elevator, go to the second basement floor first and fight Ocelot. You will not have to rescue the DARPA Chief or fight the guards with Meryl.

Find Gray Fox in the lab:

Gray Fox in the Lab while he is using his stealth camouflage by using the thermal goggles. It can be found in the room in the Tank Hangar.

Red Grey Fox:
Get to Grey Fox while dressed in the tuxedo.

Pantless Meryl:
When you find Meryl on patrol in the office, she runs to the women’s bathroom. Follow Meryl into the Women’s bathroom and reach the last stall in under five seconds. Meryl will be caught with her pants down during an FMV sequence.

Look in the vent just before the DARPA chief (Decoy Octopus) to see Meryl doing sit-ups. Leave the vent and re-enter and she will be doing one-armed push-ups. Repeat and she will be doing leg stretches on the wall. Repeat one more time and she will be doing the leg stretches while pantless.

Finding Liquid Snake after the Hind fight:
Go up to the right wall in the snowfield. Do not let Wolf see you, and press against the wall. Snake will notice a parachute and then receive some calls. Call Master Miller; it’s funny because he is Liquid.

See how Liquid Snake escaped the Hind crash:
Do not start the fight with Sniper Wolf the second time yet. Make your way to the left all the way when outside and you will see a ration and a wall. Put your back to it and you should see a parachute in the tree.

Stats when fighting Liquid:

When fighting hand to hand with Liquid at the end of the game, press Circle on controller two to display the stats of the fight.

Master Miller missing in action:

When fighting the Hind on top of the communications tower, call Master Miller. You will get no response.

Master Miller talks to you instead of Ocelot:
When you enter the room where Metal Gear is stored, go up the ladders until you are on the very top. Look at Liquid talking to Ocelot. Then call Master Miller on the Codec. Even though he is talking to Ocelot, Master Miller will talk with you.

Annoy Mei Ling:
After successfully finishing the first scenario or at the time when the game can be saved, keep calling Mei Ling. After a while she will make funny faces and may even begin to fight.

The Enchantman, Rico, and Chau Marcus:
Keep calling her and keep selecting “Do Not Save”. She will tell you not to call her for no reason. She will also give you funny faces if you continue. Also, call her from the woman’s bathroom.

Follow Meryl into the bathroom but do not go into the stall. Call Mei Ling up on the Codec and she will yell at you for being in the women’s bathroom and tell you that she will not allow you to save (however, she will allow you to do so).

See Mei Ling in her underwear:
When you crawl into the ventilator, go find Mei Ling’s cell. Look down then go back out. Come back in and look down again. Repeat this ten times and she will be in her underwear.

Get hit by Meryl:
Just before you fight Mantis, you will find yourself leading Meryl to the commander’s room. On the way, punch, kick, and/or shoot Meryl. She will smack you, costing a small part of your energy. Avoiding her is easy. Shoot her from a far distance, then run. You will get away with it. Be careful; if you overdo it, you will kill her.

Annoy Meryl:
Punch Meryl just before you fight Psycho Mantis. She will chase and punch you.

In the main hall on the floor that you fight Psycho Mantis on, go into a cardboard box and look at Meryl. The longer you look at her, the redder her face gets. She also will make some comments.

After fighting Psycho Mantis, equip your scope and zoom in on Meryl’s chest. She will say “What, what is it?”, “What are you staring at?”, “Snake, don’t look at me that way.”, and “Come on, we don’t have time for this.”

Look at Meryl with the scope or camera.

After going to all floors, go back through the ventilation shafts and back outside to the chopper area. Call Meryl and she will say that you do not know where you are going.

Shoot Meryl with any weapon during the first battle with Sniper Wolf without leaving to get a sniper. You will get very funny calls. The more you shoot her, the more funny calls you will get.

Fight Meryl without her losing health:
When you fight Meryl, run up to her and throw her instead of punching her. She will not lose health.

Annoy Nastassia:
Call her from the woman’s bathroom.

Annoy Naomi or the Chief:

Shoot the rats or birds. Naomi or the Chief will call and reprimand you.

Annoy Otacon:
Shoot the Super Computers during your battle with Ninja in Otacon’s lab.

Shoot a wolf before you defeat Sniper Wolf for the first time, then call Otacon once or twice.

Smoking support from Nastassia:
Call her after hearing Naomi’s long lecture about smoking. She will mention how smoking is not so bad.

Naomi’s smoking warning:
Enter the inventory and begin smoking a cigarette. Then, call Naomi to hear a long lecture on why bad smoking is bad.

Ninja rescue:

Keep going through Ocelot’s torture after Otacon gives you food. Do not hide under the bed but wait until the guard is done vomiting. He will have to vomit five or six times. The ninja will now help break you out.

When you are getting tortured by Ocelot and you do not submit, Johnny (the guard) will take you to the cell Although you get many chances to get out, do not. When Johnny brings yoy in for more torture, try to survive until he puts you back in the cell. Continue this process without escaping, and the ninja might be the one that breaks you out.

Annoy Ninja:
When you fight the Ninja in the computer room, toss chaff grenades. The Ninja will insult you for using weapons.

Annoy Vulcan Raven:

Shoot the ravens outside of the second elevator, then move on to fight Vulcan. A second sequence about why the birds should not be killed will be displayed.

Guard on the toilet:
While crawling in the air duct to save the DARPA Chief (Decoy Octopus), turn left on the first turn where the SOCOM bullets are located. Look through the first vent to see the guard of the cell on the toilet talking about Meryl.

Sick guard:
When you get into the torture room finish a session, return to the cell and let all of your escape attempts fail. Use the ketchup when the guard can see you. Hide under the bed then come out when the guard sees you are gone and let him lock the door again. When the Ninja appears and blows open the door, run out and hit the guard but do not knock him out. Run into the torture room as far as possible and you will automatically stop. When you do, the guard comes but runs to the bathroom again. For extra fun, go to the bathroom door, press against it and knock. Release the D-pad to hear the guard moan.

When being held prisoner, continue to watch the patrolling guard. After a short time, he will bolt for the bathroom and an FMV sequence will start. After it ends, lay down and crawl under the bed. The guard will not be able to see you, and will enter the cell thinking you escaped. Crawl out (you might get shot once in doing this), use the ketchup to heal, and choke out the guard. You are now free and will find your equipment nearby, Note: Reveler Ocelot planned on you escaping, and put a bomb in your equipment. Search through your things, find it, and throw it away.

Guard killed by guards:
When Otacon gives you the ketchup, escape without using it. Go somewhere outside where there are guards. Lay down in the snow and select the ketchup. Solid Snake will immediately spill the ketchup. Wait until a guard walks by and sees you. He will freak out and go for help. Hide somewhere where you can still see the ketchup stain . In a little bit, the guard return with some friends. He will show them the ketchup. One of them will get mad and shoot him.

Melting guards:
Equip the “stealth” item when you start disc two. Go to the cat walk over the liquid metal. Get in between the guard and the railing and use the “flip” technique to throw the guard over the railing into the metal.

Exploding guards:
Equip the stealth gear, stand near a soldier and press Square to set a C-4 explosive. Snake should automatically move in place and set the C-4 on a soldier. Get to a save distance and detonate it.

Flying guard:
Look for an area with a lot of space in front of you and a reasonable space behind you, such as under the stairs in the tank hangar. Face the door at the other end (the room with the SOCOM suppresser) and choke a guard until he is knocked out. Place a Claymore as soon as he drops to the floor and run a short distance back. Take out your FA-MAS and point it at the guard (this is easier with Bandana) and fire, even if he is not up. When he gets up, he will fly across the screen so fast it is hilarious to see. To make it funnier, look at him in first person view or at the radar.

Hiding from guards:
Places to crawl under include the two tanks in the tank hangar, desks in various rooms, shipping trucks, and a small hole in the canyon. Crawling will prevent the guard from finding you. But do not allow the guard see you crawl under something or they will throw grenades at you.

When in the jail cell while the guard is on patrol, hide under the bed. The guard will ask, “What the hell are you doing?”

Confusing guards:Put on the Stealth Gear and run through a guard. He will look in the direction you came from and say “Hmm. What was that?”, with a question mark over his head. When he looks that way, get in front of him and take off the stealth gear. He will be alerted of your presence. When he has seen you, put the stealth gear back on immediately, before he shoots. He will then be confused and start looking for you. You can do this as many times as needed. This also works with the search light area in the beginning of the game.

Kill less guards:
After the DARPA chief dies, Meryl will open the cell door. After the FMV sequence three will appear guards. Shoot them. Then, Snake will tell Meryl to shoot. She will kill the next set of guards. Just keep running around and Meryl will kill all the guards. This is helpful if you want to get a higher ranking at the end of the game.

Faster and easier game:
When you first find Meryl and she runs into the elevator, do not chase after her. Instead, run into the door to the left of the elevator. You will only have to fight Raven in the cold room next to the furnace room and Sniper Wolf in the cleared snowy area.

When in the first area, walk over to the sleeping guard. Flip him and crawl into the vent. You will see rats in the vent. Chase them and they will lead you directly to area 2.

Open Level 5 hangar door:After defeating Revolver and the brief talk with the arms tech president, leave that area and return to the armory (B2 of Tank Hanger). Dial 140.15 on the codec to reach Meryl. By the time you return to the first floor of the tank hanger, she will have the level 5 hanger door open for you.

Getting upstairs in the first communications tower:
Equip the Bandanna and stun grenades just before the soldiers arrive. Run up the stairs and keep throwing grenades to keep them down.

If you have the Bandana, equip your stun grenades. When climbing the stairs, keep tossing your stun grenades and pressing Left. Do not bother to open the door on the way up, as it is frozen shut.

Opening certain doors without a key:
Use the guards to open doors. Just get them close enough to the door and they will open it.

Secret rooms in the Armory:
Get some C-4 from a room in the Armory, then go to the wall on the left side of the elevator. Look for the different colored wall section. Put some C-4 down and blow it up. There should be some ammunition inside. Do the same on the right side of the elevator, but watch out for the trap doors inside.

Exploding restroom:

Get the Bandana and some C-4 explosives. Go to the bathrooms on the floor where Psycho Mantis is fought. Wait for a man to go to the restroom, then equip the Bandana, place a some of the C-4s on his back, then detonate. You can place the C-4 anywhere on their body.

Get past the blast furnace:

Go to the west wall. You should be able to walk on the ledge by pressing Up/Left.

Items in the blast furnace:
When in the blast furnace, go into the room with the steam coming out of the walls. Look around on the floor for a hole, then crawl through it. There should be two surveillance cameras and what appears to be six lockers (front to back ). There should be two boxes that contain stinger missiles and a box of chaff grenades. Look behind the six lockers to find the body armor.

Diving off the dock:
At the dock at the beginning of the game, get detected by the enemy and move towards the right side of the dock. When you reach the edge, Snake will dive off the dock and into the water. This is also shown in the FMV sequence.

Destroy the gas electric floor:
Take out your Nikita Launcher and shoot the missile directly across that room. Press Triangle (PlayStation version) after you shoot to guide it where needed. Take a right down the room and then a right around the corner across the room through that doorway (which appears to be difficult to get through), right in the room in the doorway, then left at the generator. Note: Watch out for shooting cameras. This can be repeated until you are successful. Go back and forth when air gets low out of the room.

Heliport items and weapons:
Use the following steps to get three items and three weapons in the Heliport. You will start with the Scope and Cigarettes. To get the Rations at the Docks, kill a guard. When you start, go in the water and behind the barrel. Go up until you see the elevator and then go straight right. Go up until you find a wall (not very much) then go right until reaching a passage where you can go down. Go down, and then right. At the Heliport, kill a guard, then go right until you are in the snow. Then, go up. The Socom Pistol is in the cargo truck. The Chaff Grenades are in the searchlight area. The Stun Grenades can be found by going around the Searchlight area and then down until reaching a small room past the surveillance camera.

Shoot tracer bullets from the Fa-Mas:
Obtain the Bandana and the Fa-Mas. Shoot the Fa-Mas until you only have three bullets left. The bullet gauge should be in the red zone. At that point, equip the Bandana and fire. Snake should be shooting yellow tracer bullets that appear to be lasers.

Auto-aimed Fa-Mas:

The shots that are fired when the “Shoot tracer bullets from the Fa-Mas” trick is used will automatically be aimed. This is especially useful when Snake is jumped on elevators, or is being chased after being spotted.

Finding the pistol:
When starting the level that has the search lights, go to the closest entrance for the search lights. Get ready when the search lights stop. When they begin moving again, enter the search light area, quickly go to the left, and get out of the search light area. Then, move straight and to see a truck with two cameras and guards. Go to the truck and get in the back. The pistol should be there. There should also be a box that may be used for hiding. Note: If enemies see your character entering the truck they will throw grenades.

Using weapons in the nuclear warhead storage room:
You cannot use weapons in the nuclear warhead storage room but they can be used from the outside. Use the PSG-1 to sniper the guards from under the door before going back inside.

Double claymore mines:

Set a claymore mine. Then walk over it to pick up two mines.

Shoot SOCOM or Fa-Mas across rooms:
You can accurately shoot your SOCOM or Fa-Mas across entire rooms. Equip either Night Vision Goggles or Thermal Goggles and look at the targeted guard in first person view mode. The view will be broken up by a y-axis line and a x-axis line, forming crosshairs not unlike the those from the PSG-1. Line the intersection of the crosshairs on the guard’s body, like you would if you were shooting the PSG-1. Release the first person view mode, the shoot the guard.

Improved PSG-1 sniper rifle control:
If you are out of Diazepam, switch to Snake’s cigarettes in the item screen. Your aim will instantly steady, but your health will slowly deteriorate until there is almost nothing left. You will not die, but you will be extremely vulnerable. Note: Switching away from the cigarettes will immediately cause your aim to shift again, unlike the longer-lasting effects of Diazepam.

Killing without any weapons:
Go on a balcony or another high location. Start punching an opponent, but keep him close to the edge so that he can fall when Solid Snake does his last kick. He should fall off the balcony, and instead of getting knocked out, he will die.

Increase damage while fighting:
While fist fighting, go in a flight of stairs. When Solid Snake does the last kick, your opponent will fall down the stairs will be knocked out for longer than normal.

Extra time fighting Liquid Snake hand to hand:
When fighting liquid snake on top of the destroyed Metal Gear Rex hand to hand, the time limit is usually 2:30. However if you die once, skip the intermission sequence to get 3:00 as your time limit.

How to defeat Gray Fox:
Do not use weapons; just punch him. When he starts to get tired and is “slow fighting”, use your chaff grenade. Then use any desired weapon against him.

How to defeat Mantis:
Plug the controller into another port and shoot him. Make sure to destroy the portraits as he will attack you with them. Throw Meryl to subdue her when necessary.

How to defeat Ninja:

Toss some Chaff Grenades then hit him with the FA-MAS. Towards the end, when he is crouching, roll into him.

How to defeat Ninja:
Put away your weapon and start punching him. He will jump away from you and put away his weapon. Throw more punches at him and he will turn invisible and hide. Throw a chaff grenade to stun him and then use your Fa-Mas/SOCOM to hurt him. Keep doing this until he is dead. Note: He may take out his weapon again if you use yours. When his health is gone, a force field will surround him. Aim at him and shoot. You will have to do this three times.

After the battle is over, when the Ninja is surrounded by the energy field, instead of finishing him off with three punches you can use any desired weapon.

After he loses his sword in Octacon’s lab, throw chaff grenades. He will stop and you can run up to hit and kick him. You have to hurry because he will kneel down in about seven seconds and wait for it to clear. After you kick and hit him, he will also kneel down.

How to defeat Ocelot:

Use the SOCOM or M9 and shoot him in the head whenever possible. C4 can also be used.

How to defeat Wolf:
Use the Pentazem. Zoom out to find her, then assail her with head shots.

How to defeat the Hind-D:
Use Stinger missiles. Fire whenever it locks on.

How to defeat Raven:
Keep planting Claymores and C4. When possible. track him with the Nikita. Beware his range and never approach him from the front.

How to defeat Revolver Ocelot:
Use the shoot while running trick and follow him around the arena. Keep shooting him in the back until he is down.

Use the M9 and hide behind a pillar. Go into first person view and peek out of the side (hold L1 or R1) and shoot one round at his head. Alternately, place C4 in one corner and run to the opposite one. Detonate it when he is near the bomb.

How to defeat Metal Gear-Rex:
Use the Stinger missiles. Run when it is about to attack.

Go under Rex; he will not see you; if he does he going to attack you. Throw a chaff grenade anywhere. It is still going to stun for a few seconds. Stand behind Rex and fire a Stinger missile at the radar dome. Keep repeating this until the radar dome is destroyed. After the FMV sequence, keep firing stinger missiles at the cockpit until he dies.

You do not need a lock-on to defeat Metal Gear Rex. Just aim the Stinger at the radar dome (part 1), or the cockpit (part 2), and fire. This works especially well in part 2 by running between his legs and firing at the underside of the cockpit.

Before he wakes up, go behind him and get ready to shoot. When he moves or turns, shoot him then throw a chaff grenade. Shoot him again until the chaff wears out. Immediately before it wears out, get behind him and kill him.

Hide behind one of the parts sticking out on either side of the room. Then, just wait until Rex turns around and shoot him. Hide behind the part sticking out just before the missile hits him. This only works when you are shooting the round thing on his left arm. Keep doing this and you should be able to defeat him after some time.

How to defeat the M1 Tank:
Use the chaff grenade. Get close and repeatedly toss grenades.

Throw a chaff grenade on the ground, and when it explodes, run towards the tank and throw a grenade into the tank. If the grenade does not go into the tank, it will take a small amount of health off. However, if it did it will instantly kill the guard. It is possible to defeat the tank with only two grenades.

How to defeat Psycho Mantis:

Plug the controller into port two and press any button before fighting Psycho Mantis. The word “Hideo” will appear in the corner of a black screen. Use controller two to fight against Mantis to keep him from knowing your moves. Alternatively, shoot the statues in the top corners with the fa-mas to render Psycho Mantis without his psychic abilities.

Throw a stun grenade right when Psycho Mantis takes control of Meryl. When he starts to attack, pause game play and switch to controller two.

If you have a Bandana, shoot in one large circle. If he throws chairs around, crouch on the ground so you will not be hit.

If you have no way of seeing Psycho Mantis when you fight him, run around. If the screen zooms in, he is nearby.

To keep Psycho Mantis from reading your mind, destroy the two statues on both sides of the room, toward the back. They are of Mantis’ face. He hates to see himself.

Always see Psycho Mantis:
You can see Psycho Mantis wherever he goes if you use the thermal goggles. It can be found in the room in the Tank Hangar.

How to defeat Sniper Wolf:

Use the stinger missiles to kill Sniper Wolf easily in the Snow Field area. They not only reveal her location, but also home in and deliver a lot of damage. It will take about six stinger missiles to kill her, and you will almost never get hit.

Although it is easier to kill Sniper Wolf with the stinger, it is fun to kill her with the Nikita remote controlled missiles.

On second encounter with Sniper Wolf, hide behind the ride that was on the far right as you came out the door . Fire a Nikita missile at her. You have to take the missile up a gentle slope or it will hit the ground and explode.

When you are in the second battle with Sniper Wolf (in the snow field) you can defeat her easily by using the Nikita missile launcher instead of the PSG-1 sniper rifle. To do this, center yourself in the area on the left side of the little cliff in the snow. If you are not sure where it is, toggle on the Rations (so your life gets refilled while she fires at you) and you can put on the Scope and find the cliff. When you have done this, you can position yourself on the left side of it and fire the Nikita missile at her. After the missile is fired, hold Triangle and watch where the missile is going. When it reaches the left side of the cliff, it will bounce up, and from there you can find Sniper Wolf with the missile and let it hit her. Repeat this process and she will go down in no time. Note: This only works in the snow field battle.

How to defeat Vulcan Raven:
Use the Stinger when facing those opponents. It will track them even when out-of-sight. When facing Vulcan Raven, get in an outer corner and wait until he comes into sight. Fire, then run to another outer corner and repeat.

Equip the Nikita (remote control missile launcher) and hide. Fire and use your radar to navigate the missile to Vulcan Raven. Note: You must hit him quickly in the back. Because of his genetic engineering he can sense the missile approaching, and will shoot it in mid air. It will take ten to fifteen hits to kill him, but this method is much safer.

Another technique to take out Vulcan Raven is to place claymores around the board and simply letting him walk into them. Lure him to the places that the claymores were planted by allowing him to see and follow you.

Another technique is to enter the fight with the maximum number of C4. Plant a block at an intersection of crates and watch the radar. When you see Vulcan Raven walk at the point it was placed, detonate it to blow him up and take a chunk out of his life bar. Also, to reduce damage from him, go to where the Ninja with a Level 6 card was fought and grab the Bulletproof Vest. Bring it back and wear it. It reduces the damage by about half.

When fighting Vulcan Raven the first time (in the tank), at the beginning use about three chaff grenades then run against the left wall. Keep going and watch out for mines. Run up to the tank and throw grenades on top of them or in the hole. Try to get as many as possible in the top hole so it takes his life down easier.

You can slow down Vulcan Raven’s tank when fighting it by going near it (after throwing a chaff) and planting a C4 on its tracks.

When fighting Vulcan Raven the second time, shoot Stinger or Nikita missiles at him. Note: Watch out for his gun; he can shoot it well and can shoot down boxes. Some may have items fall off them.

To avoid being caught or shot by Vulcan Raven, when you see him on the other side of your radar (opposite of you), lay down a group of claymores and run around (instead of using Nikitas to where you need to stop and risk getting caught). This may take longer, but he still loses a lot of health.

Let your mines and C4 do the work for you; forget using the stinger. By using your Bandanna (if available), you con keep running or find a nice place to hide.

How to defeat transparent Bosses:

When fighting any transparent Boss, such as Ninja or Mantis, use your Thermal Goggles to see his location and kill him faster.

How to defeat stealth enemies in the cargo elevator:
Instead of using your FAMAS, just snap their necks. By doing this, it is much faster and you will not lose as much health.

How to defeat attack teams:
Aim for the top of their head or their legs. These areas are unprotected by their shields, and thus are their weak points.

Low blow attack:
While using the Stealth Camouflage crouch down and plant a C-4 on a guard’s crotch. Detonate and the guard will say shout and hold himself.