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Gamecube - XG3 Extreme G Racing cheats

Unlimited Shield & Boost 
Press L + R, Z, L + R, Z at the main menu.

Unlock all tracks and teams:
Hit L, L, R, R, Z, Z, L + R + Z at the main menu.

Unlock Extreme Lap Challenge 
Hit L, R, L, R L, R, Z, L + R at the main menu.

2x prize money
Hit L, R, Z, L, R, Z, L + R at the main menu

Unlimited Ammo 
Hit L, R, L, R, L + R, Z at the main menu

Win Next Race 
Press L + R + Z, L + R, Z, L + R + Z when you see the "Press Start" text 
at the title screen. 

Always Win XG Career Races 
Hit R, L, Z, L, R, Z, R, L, Z when you see the "Press Start" text 
at the title screen. 

Open extra Tournaments:
Open the 500G class, finish the Caesium 250G tournament. 
Open the 750G class, finish the Caesium 500G tournament. 
Open the 1000G class, finish the Caesium 750G tournament.