Extreme
G3
Infinite shields and turbos
At the main menu, press L1 + R1, L2 + R2, L1 + L2, R1 + R2. If you entered the code correctly, an "Unlimited Energy/Turbo" message will appear. Note: The effects of this code only last for one race and must be re-enabled before the start of the next race. -From: lgz@kc.rr.com
Infinite ammunition
At the team selection screen or the screen with the League Race and XG Mall options, press L2, R2, L1, R1, L2 + R2, L1 + R1. If you entered the code correctly, a message will appear. Unlimited ammunition will be available in one or two player games. This is especially useful when paired with the Rear Blaster item.
All tracks
At the main menu, press L1(2), L2(2), R2(2), R1(2), L1 + R1 + L2 + R2. If you entered the code correctly, a message will appear.
Always win XG career mode races
At the main menu, press L1 + R1 + L2 + R2, L2 + R2, R1 + R2, L1 + R1 + L2 + R2. If you entered the code correctly, a message will appear.
Extreme lap challenge
At the main menu, press L1, L2, L1, R1, L1, R2, L1 + R1, L2 + R2. If you entered the code correctly, a message will appear.
Double prize money
At the main menu, press L1 + L2, R1 + R2, R1 + R2, L1 + L2. If you entered the code correctly, a message will appear.
Quick start
To get a jump start when you begin a race, hold Forward during the countdown
without pressing Gas. As soon as "Go" appears, hit the accelerator.