Be The Cop
Message: Z, C-Left, C-Down, C-Left, Z, L, R, C-Down.
Extra Bikes
Use Big Game Mode to finish all the races to get 2 new bikes capable of 300mph+
Get Scooters
At the main menu press C-Down, C-Right, C-Up, C-Left, Z, Z, L, C-Left.
Infinite spikey clubs in Big Game mode
For some strange reason, if you type in the All weapons code (C up x4, c down, L, c left, z) and go into Big Game, you will have unlimited spiked clubs. This enables you to continually use them to jam people over and over until you turn the game off.
Insanely Fast Bikes
At the main screen put in Up, C-Left, C-Left, C-Right, Left button, Right button, C-Down, and Z.
Insanity Level
At Thrash Mode press C-Up, C-Left, C-Left, C-Right, L, R, C-Down, Z.
Stages
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.
Turbo Start
Hold down A when the race starts for a turbo start.