Extreme G3 Cheats for GameCube
At the start screen, press L, R, L, R, L + R, Z.
All teams and tracks
At the start screen, press L, L, R, R, Z, Z, L + R + Z.
A message on your telly will confirm that the code has been entered correctly and activated
You will have to enter these cheats before every race, as they de activate themselves after each race.
For Unlimited Sheild Enter - L+R,Z,L+R,Z
For Unlimited Ammo Enter - L,R,Z,L,R,Z,L+R,Z
For Double Prize Money Enter - L,R,L,R,L+R,Z
Press start at any time during a race and press, L + R , Z, L + R , Z.And you will get unlimited shield ( Turbo ).