Type these codes anywhere in the Main Menu:

ARCADE MODE:

Code                            Result
TR                                 00-15 Drive As Traffic Cars
GOFAST                       Upgrade Engine
MONKEY                      Upgrade Automatic Transmission
MOON                          Low Gravity
MADLAND                    Super Human Opponents


CAREER MODE:

Code                             Result
BUY                               Free Purchase
UP0                               No Upgrades
UP1                               First Upgrade
UP2                               2nd Upgrade
UP3                               3rd Upgrade
GATES                          Cash Increase


HOT PURSUIT MODE:

Code                            Result
DCOP                           Bonus Hot Pursuit Car
ECOP                           Bonus Hot Pursuit Car
FCOP                           Bonus Hot Pursuit Car


OTHER:

Code                            Result
ACAR                           Bonus Car
BCAR                           Bonus Car
CCAR                           Bonus Car
CARS                           All Cars
TRACKS                       All Tracks
ALLTIERS                     Open All Tiers
OUTMYWAY                 Horn Causes Other Racers to Crash
RESETYA                     Horn Causes Other Racers to Reset


Note: OUTMYWAY and RESETYA can be used at the PAUSE screen.

Mini-Game Easter Egg:

To get to it, simply start the game, click credits icon. Change the credits display from text, to photos at the top, then when you see a photo start to click on them over and over until they stop, and you will enter a mini-game called "Click the photo". A photo will pop up somewhere on the grid of someone in the photos, and you must click on them as fast as you can to score points. The mini-game keeps high score, so you can always come back and flash your record to your friends.