Metal Gear Solid 2: Sons Of Liberty

Alternate title screen:
Successfully complete the game. The title screen will turn blue.
EXTERNALDRAGON.

To see the alternate title screen without completing the game, load your game file but do not begin game play. Instead, return to the title screen and it will alternate from Raiden's face to Solid Snake's face.
Yukon_Snake.

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.
Brandon Welch.

If you do the first set of pull-ups as Raiden to get grip level 2, you can do a hundred more to get grip level 3. You cannot get grip level 4, as Campbell will tell you are neglecting your duties and need to get on with the mission.
Sct3197.

Control intermission sequences:
Much like the Codec transmissions, you can also press L1 or R1 to zoom in during an intermission. The harder you press, the more the zoom. You will hear a gunshot. While holding the button, use the Right Analog-stick to move the view. Also during certain parts of some intermissions are sections where it looks like you are viewing the scene through a camera or binoculars. You can use the zoom feature with these as well, and the onscreen distance or zoom indicators will increase realistically the more you zoom in. This also can be done at the beginning of the game, before pressing Start. Note: L1 and R1 are pressure sensitive. How hard you press determines the amount of zoom.
leviathan, nagle10, Onmymind, Kyle Desjardins, Magnum, Kyle Norman, and others.

During an intermission sequence, you can zoom in by pressing L3.
David Enlow.

Control title screen:
Press L2 to hear a gunshot and see a flash at the title screen.
MaeBracken, Bonfire, and Andrew Wei.

Use the Right Analog-stick at the title screen to change the background color.
Gamer309.

Control Codec sequences:
Press the Left Analog-stick or Right Analog-stick to move the faces. Press R3 or R4 to zoom in.
Mirelle99.

When using your Codec to contact Otacon or others in the game, press R1 or R2 to reveal Snake's or Raiden's thoughts about those persons, with some funny phrases. You will also hear who they really feel about their women.
Pouya Gharavi, Bagel The Dog, TheOuterHeaven, Eric Kriegermeier, Magnum, and others.

Quick skip Codec calls:
Press X button to stop the talking, then hold Square until the Codec conversation is done. This is useful when advancing past long, boring intermissions, or intermissions that you have already viewed.
Grub Fisher.

During Codec sequences, press X followed by Triangle. The game will rapidly scroll through all the dialogue and close the Codec function on its own.
Jacob Pearce.

To fast forward Codec calls, press Triangle.
Mr Easy.

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.

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.
EYEHAWK78.

In-game reset:
Hold L1 + R1 + L2 + R2 and press Start + Select during game play.
Paintball7777.