Also see Gameshark Codes for Extreme-G 2
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Enter any of the following passwords for the corresponding effect:
To get a fast start with any bike, rev your bike up until it is almost close to the second block in the speed meter. When the announcer says go, immediately press and hold Z to start ahead of the other racers.
Enter your name as RA50 then start a race. While racing, press Start to pause the game then select Quit and say Yes. When you get to the placing screen select "Go, Go" and you'll be advanced to the next level.
Secret Bikes (The Easy Way)
Enter any of the following passwords to obtain the corresponding bike:
Secret Bikes (The Hard Way)
Finish any of the following tasks to obtain the corresponding bike:
More Multiplayer Levels
Enter the Venom or Wasp Superbike codes, then enter the password N31GG76CG9DZ.
Spectre Bike and Duel Mode
Enter the password HSFDCCV611FV.