Extreme-G
Enter your name as "RA50" at the name selection screen. If you now quit during a race at any point, the game will still pretend that you finished it in whatever position you were when you selected the quit option.
Try out this fun Easter Egg: Enter your name as "XGTEAM" at the name entry screen (you should hear a confirmation noise), then go back and change it to the first name of one of the game's programmers, such as Ash, Greg, John, Shawn, Justin (you can find more names in the credits). Tthe faces of the Extreme team will now appear on top of the bikes.
The programmers of Extreme-G have hidden the face of Probe's director in the game. Enter your name as "FERGUS," then go into the Shoot 'em Up Mode. The drones will now have turned into Fergus's face. You can now shoot him -- but remember that his wrath will be tremendous.
Unlock a hidden track! Beat the Extreme level of the Meltdown circuit using a regular bike (not Roach or Neon) and get first place on every track to reveal a hidden board. Unfortunately, the hidden track is small and somewhat basic and it isn't added onto any of the circuits. You can race it in the single and multi-player modes only.
To enter these codes, you must enter the bike selection screen and press the R shoulder button. Select the name input and enter any of these codes listed here. If you enter it correctly, you will hear a tone confirming that the code was entered correctly. If you wish to deactivate a code, simply enter the code again. Also, please realize that the codes affect all players.
NOTE: These codes can also be combined for a variety of effects.
ROLLER - All bikes
will be turned into boulders.
FISHEYE - Views the race with a fisheye lens; puts the
camera farther away from the bike; adds an additional feeling of
speed to the game, though distorted.
MAGNIFY - Makes everything on the screen look much bigger;
puts the camera on the front of the bike; very noticeably slows
the game down, so this might be good for players who think the
game is too fast.
STEALTH - All bikes become invisible, leaving only the
shadows.
BANANA - Makes the track extra slippery.
WIRED - Changes the game into a wireframe mode. Cool
effect.
ANTIGRAV - Wanna get sick? Try racing the tracks with
everything upside down!
GHOSTLY - Changes the background to being transparent.
XTREME - Not fast enough for you? Want to set some time
trial records? This pumps your bike's speed up to the max. Look
out for those walls!
UGLYMODE - Graphics become pixelated.
NITROID - Gives you unlimited nitros. When used, the game
uses the above "fisheye" cheat to make it seem even
more powerful.
ARSENAL - Randomly gives you any of the missile weapons
every few seconds; press the Fire Secondary Weapon button to take
advantage of this.
The following codes are entered at the Password screen. (That's in the Options menu.) There will be no sound when you enter them correctly; you just go to the appropriate mode that would have the addition.
51GG95 - Gives you
access to all levels and Roach.
61GGB5 - Opens all tracks on all worlds as well as giving
you access to both The Roach and Neon bikes.
81GGD5 - Ultimate password! Unlocks all regular
tracks, both hidden bikes (Roach and Neon), and the special
hidden track!
In addition to the cool cheat codes above, Extreme-G contains some hidden bikes beyond the initially available number of eight. If you complete a tournament using one of these, there will be a message encouraging you to use a regular bike next time. NOTE: You may need a Controller Pak in order to save these bikes for future use.
Roach
By completing the Meltdown circuit on the Novice skill level, you
will be able to access the Roach motorcycle. This one screams,
but it is a cheat bike.
Neon
If you complete the Meltdown circuit on the Expert skill level,
you will be able to access the Neon motorcycle. It's very cool
with its reflective surfaces!