Infinite ammunition
 Collect all dog tags and successfully complete the game and save. 
 Start a new game and equip the wig you have unlocked. When this 
 is equiped you will have unlimited ammunition and not have to reload.
 
 Alternate title screen
 Successfully complete the game and the title screen will turn blue.
 
 Extreme difficulty setting
 Successfully complete the game to unlock the extreme difficulty 
 setting.
 
 Increase grip strength
 Press L2 + R2 one hundred times when hanging on a ledge to do pull-ups 
 and increase your grip strength to level 2.
 
 Control intermission sequences
 During an intermission sequence, press the Right Analog-stick to 
 move the view or R1 to zoom-in.
 
 Codec control
 During any Codec conversation, press the Left Analog-stick or Right 
 Analog-stick to control the character's faces. Press L3 or R3 to 
 zoom-in on the faces. Press R1 or R2 while Snake or Raiden is listening 
 to someone to hear their thoughts.
 
 Game Shark Codez: 
 North American Version 
 
 Full Version Codez:
 
 Master Code (Must Be On):
 EC8783B4 14483424
 
 Tanker Level Codez:
 
 Infinite M9 Ammo:
 4C89EE12 1456E788
 
 Infinite USP Ammo:
 4C89EE18 1456E788
 
 Infinite Magazines:
 4C89F134 1456E788
 
 Infinite Grenades:
 4C89F132 1456E788
 
 Infinite Chaff Grenades:
 4C89F128 1456E788
 
 Infinite Stun Grenades:
 4C89F126 1456E788
 
 Infinite Rations:
 4C89F1A2 1456E788
 
 Infinite Bandages:
 4C89F1AC 1456E788
 
 Have Therm Goggles:
 4C89F1BA 1456E7A6
 
 Have DG. Camera:
 4C89F1BE 1456E7A6
 
 Have Body Armor:
 4C89F1AE 1456E7A6
 
 Have Bandana:
 4C89F1E4 1456E7A6
 
 Have Stealth:
 4C89F1B4 1456E7A6
 
 One Pull-up Increases Grip to Level 2:
 0C89EEE2 1436E788
 4C89EEE2 1456E788
 
 Two Pull-ups Increases Grip to Level 3:
 0C89EEE2 1426E788
 0C89EEE2 1436E7E4
 4C89EEE2 1456E7E4
 
 Plant Level Codez:
 
 Infinite M9 Ammo:
 4C89F062 1456E788
 
 Infinite SOCOM Ammo:
 4C89F066 1456E788
 
 Infinite PSG1 Ammo:
 4C89F06C 1456E788
 
 Infinite RGB6 Ammo:
 4C89F06A 1456E788
 
 Infinite Nikita Ammo:
 4C89F070 1456E788
 
 Infinite Stinger Ammo:
 4C89F06E 1456E788
 
 Infinite AKS-74U Ammo:
 4C89F07E 1456E70C
 
 Infinite M4 Ammo:
 4C89F088 1456E70C
 
 Infinite PSG1-T Ammo:
 4C89F086 1456E788
 
 Infinite Magazines:
 4C89F084 1456E788
 
 Infinite C4:
 4C89F072 1456E788
 
 Infinite Claymores:
 4C89F074 1456E788
 
 Infinite Grenades:
 4C89F082 1456E7B1
 
 Infinite Chaff Grenades:
 4C89F078 1456E788
 
 Infinite Stun Grenades:
 4C89F076 1456E7B1
 
 One Pull-up Increases Grip to Level 2:
 0C89EEE8 1436E788
 4C89EEE8 1456E788
 
 Two Pull-ups Increases Grip to Level 3:
 0C89EEE8 1426E788
 0C89EEE8 1436E7E4
 4C89EEE8 1456E7E4
 
 Demo Codez:
 
 Master Code (Must Be On):
 ECB79FF8 1456E60A
 
 Infinite Rations:
 3CBB523E 1456E7A2
 
 Infinite Bandage:
 3CBB5246 1456E7A2
 
 Infinite Diazepam:
 3CBB524A 1456E7A2
 
 Infinite Grip:
 4DD121CC 1456E89D
 
 Have M9 & Infinite Ammo:
 4CBB53CE 1456E788
 
 Have USP & Infinite Ammo:
 4CBB53D4 1456E788
 
 Have SOCOM & Infinite Ammo:
 4CBB53D2 1456E788
 
 Have FA-MAS & Infinite Ammo:
 4CBB53D8 1456E788
 
 Have C4:
 4CBB53E2 1456E781
 
 Have Chaff Grenade:
 4CBB53EC 1456E7A1
 
 Have Stun Grenade:
 4CBB53EA 1456E7A1
 
 Have Grenades:
 4CBB5300 1456E781
 
 Have Enemy Uniform:
 3CBB5250 1456E7A6
 
 Have Empty Mags:
 4CBB53FA 1456E781
 
 Have Camera:
 4CBB5262 1456E7A6
 
 Have ST Camera:
 4CBB53E8 1456E79F
 
 Have Box A:
 3CBB5276 1456E7A6
 
 Have Box B:
 3CBB5278 1456E7A6
 
 Have Box C:
 3CBB5268 1456E7A6
 
 Have Wet Box:
 3CBB527C 1456E7A6
 
 Have V Sensor:
 3CBB527A 1456E7A6
 
 Have Tobacco:
 4CBB5266 1456E7A6
 
 One-Hit Kill Olga:
 4DE8B5AC 1456E7A6
 
 Japanese Version 
 
 Demo Codez:
 
 Master Code (Must Be On):
 ECB78550 1456E60A
 
 Infinite Rations:
 3CBB4E3E 1456E79F
 
 Max Rations:
 3CBB4E7E 1456E788
 
 Infinite Bandage:
 3CBB4E46 1456E79F
 
 Infinite Diazepam:
 3CBB4E4A 1456E79F
 
 Have M9 & Infinite Ammo:
 4CBB4FCE 1456E781
 
 Have USP & Infinite Ammo:
 4CBB4FD4 1456E781
 
 Have FA-MAS & Infinite Ammo:
 4CBB4FD8 1456E788
 
 Have Enemy Uniform:
 3CBB4E50 1456E7A6
 
 Have V Sensor:
 3CBB4E7A 1456E7A6
 
 Have Tobacco:
 3CBB4E66 1456E7A6
 
 Have Box A:
 3CBB4E68 1456E7A6
 
 Have Box B:
 3CBB4E78 1456E7A6
 
 Have Box C:
 3CBB4E76 1456E7A6
 
 Have Wet Box:
 3CBB4E7C 1456E7A6
 
 
 Joke code:
Quickly press Up(2), Down(2), Left, Right, Left, Right, X, Circle at the clear code 
screen. You will hear Snake yell, but the code (the classic Konami code) does 
nothing. 

In-game reset:
Hold L1 + R1 + L2 + R2 and press Start + Select during game play.

Game records:
Go to http://www.konamijpn.com and click on "English page". Next, click 
on "Products", followed by "Metal Gear Solid 2", followed by "Game Records". Find 
the place where you submit your user name, password and the part of the game 
you are on. Find the place where you type in this code and your password. The 
code is JBBG-TZYD-UOBZ-RGND-EHIB-XGPD-SE.


Extreme Mode 
After you beat the game once, you'll unlock the Extreme difficulty level.  

Unlockable: Get Digital Camera 
After you beat the game, you can play the game over with the same save and 
you'll have the Digital Camera in your inventory for both the Plant and Tanker 
episodes. You can use this to take pictures and save them onto your memory 
card. 

Unlockable: Get the Wig 
First play through both the Tanker and Plant episodes and get every dog tag. Then 
start a new game and save. You will then have a wig in your inventory that gives 
you infinite ammo and allows you to not have to reload.  
 
Unlockable: Getting Dog Tags 
Most of the normal guards in the game have Dog Tags that contain the names of 
the game's development team and those that won Konami's contest. To collect the 
Dog Tags you must hold up the guard and then make him shake and give it up by 
pointing your gun at his head or crotch. Dog Tags can be collected for each of the 
game's four difficulty levels. 

Bathroom Problems 
When you're listening to the converasation between Ocelot and Solidus with your 
Directional Mic, press left to point the mic at the bathroom. You'll be able to listen 
to a very humorous scene where some guy is having problems on the toilet. 
 
Daze the Guards 
Even the stealthy sometimes get caught. When this happens, a blue exclamation 
point will appear above the guard's head. If you shoot the blue punctuation mark, 
you'll knock the guard out temporarily.  

Find Ames Without Interruption From Guards 
When you get to the part where your mission is to find Ames, go to the B2 floor of 
the shell 1 core. After grabbing the Directional Microphone, go to the right of that 
room where there are 4 lockers. If you look in First Person View, you will see a 
Book on top of it. Punch at the locker it is on top of. After Raiden performs his 
spinning kick, 5 Books will fall to the floor. Grab them all, and head to B1. Watch 
the Guard's path. Find an open spot that he goes to, that also has no hostages 
nearby (such as in between the tables, or by the counter), and put one book down. 
He will stop and look at it, giving you a few minutes that you can use to find Ames. 
After a bit, the book disappears, and you can just put another one down for him. 
This also helps, because he won’t hear it if you ask the wrong hostage and they 
make noise.  

Fun with Raiden 
During any codec sequence in the plant chapter, push L1, L2, R1, or R2 to hear 
Raiden say some pretty funny stuff. 

Get the Camera Earlier in the Game 
To obtain the camera without beating the game first, simply head to the 
distribution facility and go downstairs to find the black-and-white Zone of the 
Enders box. Now go back upstairs and hop onto the platform with the three lights 
on it. Using the box, get onto the conveyer belt. Wait through the ride, and once it 
brings you into the room, get off and you'll see an item box on the floor. That's the 
digital camera. 

Make Yourself Stronger 
Anytime you find yourself hanging from a bar or edge, you can press the R2 and 
L2 buttons to make the character do a pull-up. After you do 100 of them, your grip 
strength will be raised one level. 

Skip Codec Text 
You can quickly skip through all the Codec voices and text by pressing the triangle 
button twice. The first will stop the voice and text and the second press will cause 
the rest of it to scroll through quickly. 

Special Message From Otacon 
If you take pictures of all the girl posters, and the two locker doors that have a 
guy and girl on them next to each other, and upload them to Otacon instead of the 
photos of the Metal Gear Ray, you'll get some hilarious responses from him.  

Waking up Soldiers 
If you need to get a Dog Tag from a knocked out guard, just spray coolant on his 
face to wake him up and then try to hold him up. 

Zoom-in on Cut-Scenes 
Press the R1 button to zoom in on the real-time polygonal cut scenes. When 
holding the button down, you can move the camera around slightly with the right 
analog stick. 

Easter Egg: Vulcan Raven Miniature 
In the entrance to the Engine Room on the tanker, Snake will come across a 
shadow of Vulcan Raven. It is just a toy, but if you shoot it, it will start grunting 
and shooting pellets until you leave the room. 

SNAKE's TAG:
To get Snake's Tag you need to put him on sleep w/the tranqualizer and make him 
drop it. (NOTE. if you try to knock him out w/your kick-punch combo he'll kick 
your a*s for sure)

9mm for Raiden from the start:
As you start as Raiden look on the ground were you see alot of roaches.Not the 
roaches next to the wall the roaches on the ground next to the sewer crawl down 
and you will see a open sewer crawl into it and you will find a 9mm.

Reveal Cyborg Ninja:
When the Cyborg Ninja says "I'm like you, I have no name." QUICKLY press 
R1,L1,L2,R2 and his mask will flash on and off to reveal his face. Mystery! Big 
Spoiler. It really works!

Quick Way To Metal Gear:
To get to the hold that houses Metal Gear RAY in the Tanker chapter without being 
noticed, first knock out the Marine by the projector in Hold 1, then get on your 
belly and crawl to the left side of the hold. Once you reach the left side, stand near 
the bulkhead and press Triangle to open up the maintenance hatch on the floor; 
the hatch will reveal a ladder and a secret tunnel. Climb down and go through the 
tunnel, it will lead you to the door to Hold 2. Once inside Hold 2, go to the right 
side of the hold and open up the maintenance hatch on the floor there. It too will 
open to reveal a secret tunnel. Crawl through the tunnel until you reach Hold 3, a 
movie of Snake looking at Metal Gear will play. After the movie is done (skip by 
pressing X) run over to the right side of the room Snake is in. Crawl through the 
vent, through the tunnel until you reach a ladder which leads to a ledge inside the 
Hold. Slide down the pole by pressing Triangle, and you're in!

Human Shield:
When you are facing alot of enemies, knock one out and pick him up. The other 
guards will not shoot at you. Very rarely an enemy will try to shoot you but will 
end up shooting his own partner. This is real good if you have low life.

Bloopers and Punishment:

OK, here goes: If you want to see Otacon scold Snake, just do the following: 

1) Watch the TV in the crew's lounge, then contact Otacon again. He'll scold Snake 
for being a couch potato instead of doing his duties. 

2) Light up a cigarette and contact Otacon. He will give Snake a unwanted speech 
about the dangers of smoking, blowing his cover when doing so, and informing him 
that he has to think for other people's health as do his. 

3) Hide yourself in a locker and contact Otacon. When Snake makes a crack about 
that "wee" accident, watch what happens! 

4) For you guys who love adult humor, look at the posters in First Person View 
Mode, and contact Otacon. You'll see Snake doing the unthinkable.

Prevent backup help:
When faced with only one or two enemies, try to shoot their radio/codec with a 
small weapon to prevent them from calling in reinforcements. 

Use pipes to disable enemies:
If a guard is next to a hot pipe, you can use it to your advantage. Shoot the pipe 
in specific locations to release steam and disable the guard. If the steam hits his 
leg he will limp and not be able to follow you properly. If the steam hits his arm he 
cannot shoot. If the steam hits his radio he will not be able to alert backup. 

Skip Caution Mode :
In the beginning of the plant chapter, when you get to the room with the two 
soldiers Snake knocked out, shoot them with your tranquilizer. Once they wake 
up, you will not go into caution mode, instead the soldiers will go straight to their 
positions.