Road Rash 64 - Platform: Nintendo64

Infinite 2X damage
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At the main menu, press L(4), R(4). If you entered the code correctly, 
you will hear a sound.

Infinite 4X damage
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At the main menu, press L(2), R(2), L, C-Up, C-Right, Z. If you entered
the code correctly, you will hear a sound.

All bikes and tracks
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At the main menu, press C-Up, C-Left(2), C-Right, L, R, C-Down, Z. If you
entered the code correctly, you will hear a sound.

All weapons
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At the main menu, press C-Up(4), C-Down, L, C-Left, Z. If you entered the
code correctly, you will hear a sound.

Scooters
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At the main menu, press C-Down, C-Right, C-Up, C-Left, Z(2), L, C-Left. If
you entered the code correctly, you will hear a sound.

Cop mode
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At the main menu, press Z, C-Left, C-Down, C-Left, Z, L, R, C-Down. If you
entered the code correctly, you will hear a sound.

Insanity level
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At the thrash mode screen, press C-Up, C-Left, C-Left, C-Right, L, R,
C-Down, Z. If you entered the code correctly, you will hear a sound.

Stage 2
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At the main menu, press R, C-Right, Z, R, L, C-Up, C-Left, C-Up. If you
entered the code correctly, you will hear a sound.

Stage 3
-------
At the main menu, press R, C-Right(3), R, C-Left, C-Down, Z. If you
entered the code correctly, you will hear a sound.

Stage 4
-------
At the main menu, press R, C-Right, C-Down, C-Left, C-Right(2), Z, L. If
you entered the code correctly, you will hear a sound.

Stage 5
-------
At the main menu, press Z, C-Right, C-Down, C-Left, C-Right(2), Z, L. If
you entered the code correctly, you will hear a sound.

Display debug information
-------------------------
At the main menu, press C-Right(2), C-Left(2), L, Z, C-Left, C-Up. If you
entered the code correctly, you will hear a sound.

Quick start
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At the beginning of a race, hold A to get a faster start.

Stay on the ground
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After falling off your bike, hold L to remain on the ground.

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

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

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

The Mystery Level-Get at least 52 batteries and assault a cop 19 times in
the insanity level,stage 2. You'll hear a chime at main menu press c-up 
c-down(2x) z z R L L c-down c-right FAST. You won't hear a chime this time 
go to level 5 get 52 batteries in stage 5 and you'll get the code. Its tricky 
but you'll get it after the first 10 times, don't lose  patience.