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NBA 2k12 can be quite tough to beat however I encountered this accessible reference NBA 2k12 Cheats guide that helped me through my ascend to the top levels of the game.

NBA 2k12 Cheats are entered at the main menu. A confirmation message will display when a cheat code is entered correctly. 

You'll have to enter the cheats in blindly because there is no dialog box on screen. If you input one code wrong, you are botching your chances typing any future cheats. If you're sure you made an error typing the NBA 2k12 Cheats, you'll have to restart the game for the cheats to take effect again.

In Cheat Mode, Start up your game and move on to the screen that displays "Click to continue" or "Main menu". NBA 2k12 Cheats can then be typed for the desired outcome. 

In the guide you'll acquire cheats for the complete NBA 2k12 games, on all platforms. All games from NBA 2k12 Underground to NBA 2k12 Most Wanted, Carbon,etc. on PC, Xbox, PS3, Xbox 360, Sony PSP, DS, Wii and more.

This complete guide of NBA 2k12 Cheats can be downloaded in this [http://www.dailystrength.org/people/1590606/journal/3874812 NBA 2k12 Cheats]
 site.