Cheat List:
500cc Bikes: BIGDOGS
Bowling: WRECKINGBALL
Expert AI: OBTGOFAST
Freestyle Tracks: BUSTBIG
National Tracks: ECONATION
Supercross Tracks STUPERCROSS
Unlock All Machines: MINIGAMES
Cheat: 50cc Class:
Enter SQUIRRELDOG in the character completion field.
Cheat: All Bonuses:
Enter CLAPPEDOUT on the cheats screen.
Cheat: Open Up Pro Physics:
Enter SWAPPIN in the character completion field.
Hint: Tough Demo Track Race:
Let the game sit on the main menu for a little while until the demo comes up. Press a button on the control to play that demo track. The A.I. will be tougher than usual, just for that race.