50cc Class...
	Even more cheats...
	Open Up Pro Physics...
	Play Demo Track...
	Unlock All Bonuses...
	Unlockables...

Enter SQUIRRELDOG in the character completion field.

Enter the following cheats in the Character Completion field at the Cheats screen:

Password - Effect

BIGDOGS - 500cc bikes
BUSTBIG - Freestyle tracks
CLAPPEDOUT - All bonuses unlocked
ECONATION - National tracks
MINIGAMES - Unlock all machines
OBTGOFAST - Expert A.I.
SQUIRRELDOG - 50cc Bikes
STUPERCROSS - Supercross tracks
SWAPPIN - Pro Physics
WRECKINGBALL - A.I. Bowling

Enter SWAPPIN in the character completion field.

If you leave the game at the title screen for three minutes, a demo race will start. You can join the race by pressing X.

At the Cheats screen, enter CLAPPEDOUT.

50cc Bikes: Beat all 125 cc career races in first place

500cc 4-Stroke Bikes: Beat all 250cc Career races in first place

Expert A.I.: Achieve World Ranking #1 in Career Mode

Pro Physics: Achieve World Ranking #1 in Career Mode