Extreme G3

This game is rated 8.6 by www.gamespot.com...

Cheats

No Gravity

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When you jump of a ramp press the following (don't hold down the buttons): Z, A, A, R, L, Z, Z, Z, B, A, B, A.
When you land come last in the race then start a new race and there will be no gravity.

Unlimited Shields & Turbo

Go to the press Start screen and press L + R, Z, L + R, Z.  A message saying unlimited energy Turbo will appear if done correctly

Get Jump Start

Press forward on the stick but do not hit the gas button till the Go appears

Get Starcon team

Finish XG career mode once

Unlimited Ammo

At the Press START screen press L, R, L, R, L + R, Z.  A message will appear if done correctly

2X Prize Money

At the Press START screen press L, R, Z, L, R, Z, L + R.  A message will appear if done correctly

Get Extreme Lap Challenge

At the Press START screen press L, R, L, R , L, R, Z, L + R, .  A message will appear if done correctly

Get All Teams & Tracks

At the Press START screen press L, L, R, R, Z, Z, L + R + Z .  A message will appear if done correctly

For a walkthrough on this title try these sites:

http://www.gamespot.com

http://www.cheatplanet.com