Monster 4x4: Masters Of Metal cheats and cheat codes for Gamecube

Unlock 8 bonus monster trucks:
Complete the Champ Tour to unlock Avenger, El Toro Loco, Eradicator,
Grave Digger, Inferno, Maximum Destruction, Predator and Redtoid trucks.

Unlock moon track in training mode:
Race in all off-road and find all 50 stars 

Flip your vehicle back over:
Press R3

Offroad challenge stars:
Race in training to get the stars

Collect all 50 stars easily:
Race in the offroads in the race event or training mode. 

Get $500:
Perform a somersault while you are in the course of an offroad race.

Unlocking trucks easily:
Change difficulty level to easy and finish the World Tour.