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Playstation 2 - ATV Offroad Fury cheats

Select pro-career mode, then enter any of the following 
codes as player name:

Unlock every tracks: Enter "WHATEXIT"
Unlock every ATVs: Enter "CHACHING"
Unlock expert mode: Enter "ALLOUTAI"
Faster racers: Enter "ALLQUIKI"

Resume race quickly:
If you went off-track or crashed yourself in parctice mode, press L1 + R1  

Get 1000cc Quad ATV
Finish pro-career mode once.

The worst four wheeler: Lime Green Kawasaki. 
Best four wheelers: Bonus vehicle and Polaris 500. 

Unlock two Honda Quads:
Complete the game 5 times with the Ravage 1000

Unlock Yamaha Raptor:
First win 1st place in the Pro-Career to unlockt the Ravage 1000. 
After win 1st place in the Pro-Career with the Ravage 1000.
Then beat the Pro-Career with the same ATV twice.

Preload
Press Down at bottom of a jump, after press Up and to fly like a jet.

Tricks
Hold Circle or Triangle and move the D-pad or Left Analog Stick in 
any direction.