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.
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.

Extra Bikes
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!

Fisheye Lense
If Extreme-G is still not fast enough for you, how about an optical trick that makes the scenery fly by even faster? Go to the "Contest" mode, enter your name (press R, then press R to switch to lower case in the name entry menu) and enter the word "fisheye" (all lower case). You will hear a confirmation code to tell you that the trick worked. The screen will be distorted (like with a fisheye lense) and gives you an even greater feeling of speed Try the fisheye lense for even faster speeds!

Race as a Boulder
Extreme-G lets you transform your bike (and everyone else's) into a rolling boulder. Start a new "Contest" and at the bike selection press R. This brings up the name entry mode. Press R again to switch to lower case. Just enter the word "roller" (no caps) and you should hear a confirmation sound. Start the race and get ready for a different kind of "Boulder Dash."

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