Monster Jam: Maximum Destruction Cheats - GameCube
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Unlock Champ Trucks
Complete a season on any mode and any difficulty with the truck you want the Champ version of (Grave Digger = Grave Digger Champ, etc.). These are the trucks used to unlock the special trucks (Grave Digger 20th Anniversary, etc.).
Unlock Bonuses
Big Yellow - Complete Season 2 in Cash Grab Mode on Extreme Difficulty with a championship truck.
20th Anniversary Grave Digger - Win Season 2 in Cash Grab Mode on Hard difficulty with a championship truck.
Grave Digger Champ - Win Season 1 on any mode on normal difficulty.