Cheat codes:

Turbo Start:
     Hold down A when the race starts for a turbo start.

Get Scooters:
     At the main menu press C-Down, C-Right, C-Up, C-Left, Z, Z, L, 
C-Left.

Insanity Level:
     At Thrash Mode press C-Up, C-Left, C-Left, C-Right, L, R, 
C-Down, Z.

Be The Cop:
     Message: Z, C-Left, C-Down, C-Left, Z, L, R, C-Down.

Faster Bikes:
     At  the  main  screen  put in C-Up, C-Left, C-Left, C-Right, Left
button, Right button, C-Down, and Z.

All Tracks & Cars:
     At he main menu press C-Up, C-Left, C-Left, C-Right, L, R, 
C-Down, Z.

Football stadium:
     In  level  5 race 3, in the last city after a sharp left turn and
before  a sharp right turn there is a large enterance. Go in it, it is
a  football  stadium.  There  is  a  4X there and it makes for a great
shortcut.

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Stage 2:
     At the main menu, press R, C-Right, Z, R, L, C-Up, C-Left, C-Up.

Stage 3:
     At  the main menu, press R, C-Right, C-Right, C-Right, R, C-Left,
C-Down, Z.

Stage 4:
     At  the  main  menu,  press  R, C-Right, C-Down, C-Left, C-Right,
C-Right, Z, L.

Stage 5:
     At  the  main  menu,  press  Z, C-Right, C-Down, C-Left, C-Right,
C-Right, Z, L.

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Hints:
     You  don't  have  to hit something to crash, so remember that you
have  a  brake and use it around those curves. If you take a curve too
steeply, you'll flip the bike as easily as you would hitting a car.

     Popping  a  wheelie  has one distinct advantage--it lets you jump
over  cars.  If  you  can't  get  out of the way of a car, hit A right
before you smash the car, and jump the sucker.

     You  get points for being nasty, and it can help you get to first
place,  but generally speaking, if you want to get ahead, it's best to
go around opponents instead of plowing through them.

     Because  you  don't gain access to the next level in the Big Game
mode  until  you upgrade your bike, you might want to race tracks over
to gain more money for better bikes before advancing.

Extra Bikes:
     Use  Big  Game  Mode  to  finish all the races to get 2 new bikes
capable of 300mph+

Get Girl on Bike:
     At the main menu press C-Right, C-Left, Z, L, R, C-Up

Stay on the ground:
     Hold L after falling off your bike to remain on the ground.

Stay on your bike:
     After  getting launched high in the air, you have a better chance
of  staying  on  your  bike by reducing your speed while in the air to
zero and releasing the brake once your bike hits the ground.

Avoid sharp turn crashes:
     Press A after most sharp turns to balance out your bike.

Avoid car crashes:
     Hold A just before hitting a car to perform a wheelie and use the
car as a ramp jump. Note: This maneuver will not work on log trucks or
big rigs.

Beat Down level:
     Ride  through  the  grass in the Beat Down level. The police will
ignore your biker and stop everyone else.

Disable cop:
     Pop a wheelie when you see a cop waiting on the shoulder to knock
him out.

Multi-wheelies glitch:
     Select  a  three  or  four  player thrash game. When the starting
timer reaches two, have all players hold Z + A simultaneously. If done
correctly, all the bikes will pop a wheelie and freeze the game.

Make cows moo:
     Go  to  a level where there are cows. When you see them, jump off
of one to make it moo.

Steal weapons:
     Get  your weapon to your hand during game play, then hold C-Right
until  someone  tries  to hit you with their weapon. If you are lucky,
you  will  steal their weapon and get to use it on opponents. You will
also  get  a  "Master  Thief" rating on your rap sheet i f you steal a
weapon.

Safe landing:
     If  you  get  knocked  high  in  the air and are spinning wildly,
repeatedly tap B to straighten out for a better landing.