Cheat: Get Everything
Go into player profile. Then into enter !SLACKER!. This will unlock everything.
Cheat List
Unlock all gear: FITS
Unlock more money: +foodstamps+
Unlock all ATV's: CHACHING
Unlock every track: WHATEXIT
Unlock "fast racers": ALLQUIKI
Unlock Free G-Ride ATV
Unlock a free G-Ride ATV if you have previous save data from Offroad ATV 2 (on the same memory card as the ATV3 Save).
Enter single player mode. Successfully complete the training course to unlock the Ravage Talon DX and Ravage Talon EX.
Enter single player mode. Successfully complete the training course to unlock the Ravage Talon DX and Ravage Talon EX.