Perform the following actions to unlock items for your Xbox Live Avatar.

    * Robot Knit Cap - Beat the game
    * Torchlight Logo Tee - Defeat the Overseer

Beat the game on any difficulty to unlock God Hard Mode.

Over the course of the game you will have quite a few stages where the time limit is "Indefinite" or unlimited days.

There is a limit to what you can do in the 10 minutes the game gives you for each day, but on these stages you can take almost all of the bases and then when the next day starts most of your enemy officers (the people with names) will start together, or very close, and they will take bases rather quickly... Allowing you to take them back for more experience and Fame.

Do this when you unlock a new unit type because you can get unlimited experience (if you have the patience!).

Enter the following codes to change players' head size.
Tiny Head Team - FOAM FINGER + GOALPOST + HEADSET
Big Head Team - FOAM FINGER + NFL LOGO + FOAM FINGER
Huge Head Team - HEADSET + NFL LOGO + FOAM FINGER

To unlock the option to play through the game with previous upgrades, beat the game once through. Keep in mind that you have to cycle through the end credits once, then hit Continue from the game’s main menu before going through the credits a second time. Hereafter, you can begin a new game with all of your upgrades (and more) from your previous save.

Score at least 900 points to earn the top rating (of Ninja 5) in a mission. To do this, avoid being detected as much as possible, and keep performing stealth kills, which are each worth 100 points (or 120 points if they are done when the stealth kill circle is deep red). Not using any items (except the grappling hook) and not taking any damage will also result in bonus points that will add to the total score.

First you need to enter the "A" with the accent to the right and then enter one f the letters below. EX:A with accent and the letter C, After that it should say AC then go back to the clan tag and you should see a box. After that enter to save and it should show the X Button on your controller as your clan tag. LIST down below of all the combos

    A= A button
    C = X button
    B = B button
    D = Y button
    S = RT
    R = LT
    E = LB
    F = RB
    T = D-pad Up
    U = D-pad Down
    V = D-pad Left
    W = D-pad Right
    O = Back button
    J = Invisible name (Inconsistent)
    M = Name appears under Clan Tag
    N = Start button
    P = Left Analog Stick
    Q = Right Analog Stick

For Regnier, the large swords that have the "Enchantment" enhancement can have certain magic spell abilities synthesized onto them. Some synthesizable abilities come from other characters, requiring multiplayer cooperation.

Press and hold A at the SEGA title screen to hear the classic SEGA sound.

In "The Great Rift," there is a circular room that has ledges floating in it. If you look down, it continues downward and upward. Carefully jump to the very middle top and you will see an item sitting there. This is the Feel Good costume, and it will be equipped immediately once taken.

Enter  the following passwords in the Codes menu (under "Features") for the desired effect.

    23 - Unlock the Jordan Sneaker Collection
    payrespect - Unlock the ABA basketball
    2ksports - Unlock the 2K Sports team
    2kchina - Unlock the 2K China team
    nba2k - Unlock the NBA 2K development team
    vcteam - Unlock the VC team

Here are the Secret Achievements / Trophies in WWE 12.

    Finished VILLAIN Episode! (30 points) - Complete VILLAIN episode in ROAD TO WrestleMania (Single Player)
    Finished OUTSIDER Episode!! (30 points) - Complete OUTSIDER episode in ROAD TO WrestleMania (Single Player)
    Finished HERO Episode!!! (50 points) - Complete HERO episode in ROAD TO WrestleMania (Single Player)
    For Whom the Bell Tolls (15 points) - Pin or submit Undertaker in the WrestleMania arena on Legend difficulty (Single Player)
    The Art of Submission (15 points) - Win by applying a submission to a heavily damaged body part (Single Player)
    Well Scouted (15 points) - Reverse an opponent's finishing move (Single Player)
    Thank You Edge (15 points) - Win 37 times with Edge in one session (Single Player)
    Destroyer (15 points) - Inflict heavy damage to opponent's head, arms, and legs (Single Player)
    That's gotta hurt! (15 points) - Win a FREE BRAWL by throwing your opponent through the window (Single Player)
    Master of the Brawl (30 points) - Execute a Finisher against all 44 areas in FREE BRAWL (Single Player)
    Reach the Ropes! (15 points) - Crawl to the ropes during a submission (Single Player)
    Merciless Attack (15 points) - Injure an opponent in WWE UNIVERSE (Single Player)
    You've Got Fans! (30 points) - Content you uploaded to Community Creations is downloaded 5 or more times by other

Here's something funny to try. During your adventure through Liberty City, you may find phone numbers written in inconspicuous places, such as on the side of a building or in the subway. If you dial these numbers, you'll usually get someone on the other end who you can subsequently prank.

On load screens you can rotate the models displayed with the analog sticks.