Get the indicated number of stars in the shop to unlock the following cheats. Select "Options" at the main menu. Then, select the "Cheats" option to turn the cheats on or off. Enabling cheats will disable high scores and rewards. The codes will be disabled when in Challenge mode. If the codes are used in Bounty mode you will never be awarded any stars.

Unlockable	How to unlock
Cheat #1 (top, left) "Easy Mode"	One star. Removes all civilian traffic.
Cheat #2 (top, middle) "Pew Pew"	Unknown number of stars. All weapons shoot lasers.
Cheat #3 (top, right) "Stay Focused"	Unknown number of stars. Kill any player when hit.
Cheat #4 (middle, left) "Cool"	Unknown number of stars. First person guns never overheat.
Cheat #5 (middle, middle) "Kangaroo"	Unknown number of stars. Increases player jump range.
Cheat #6 (middle, right) "Weak"	Three stars. Player never earn justice.
Cheat #7 (bottom, left) "Loaded"	Four stars. Unlimited ammunition to all players.
Cheat #8 (bottom, middle) "Stay On Target"	Five stars. Mission fails if you hit any part of the environment.
Cheat #9 (bottom right) "Nitro"	Six stars. All of player's vehicles travel faster.