Extreme-G 3

Double prize money:
At the main menu, press L1, L2, R2, R1, R1+R2, L2+L1.

Infinite ammo:
At the main menu, press L2, R2, L1, R1, L2+R2, L1+R1.

Extreme Lap Challenge:
At the main menu, press L1, L2, L1, R1, L1, R2, L1+R1, L2+R2

All Tracks:
At the main menu, press L1, L1, L2, L2, R2, R2, R1, R1, L1+R1+L2+R2

Win Next Race:
At the main menu, press L1+R1+L2+R2, L2+R2, R1+R2, L1+R1+L2+R2

StarCom team:
At the team selection screen, press L2, R2, L1, R1, L2 + R2, L1 + R1.

Unlimited shields and turbo's:
At the main menu, hit L1+R1 (at the same time), then L2+R2, L1+L2, then R1+R2.This should display a message saying unlimited energy. Start your game, but you will also get unlimited turbos once weapons and boost are activated after start. The code has to be re-entered for each race.