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Nintendo 64 - WinBack: Covert Operations cheats

Go to the title screen (where you see the "Press Start") and quickly 
press the following buttons. If the codes are accepted, you should 
hear a gunshot.

Unlock Trial mode:
Hit Up, Down, Down, Right, Right, Right, Left, Left, Left, Left, 
then hold C-Down and press Start

One shot kills:
Hit C-Left, C-Right, C-Left, C-Right, C-Up, C-Down, C-Up, C-Down, 
then hold L and press Start

Max power mode:
Hit L, C-Right, C-Left, C-Right, C-Left, C-Down, C-Up, C-Down, 
C-Up, then hold L and press Start 

Unlock all multi-player characters:
Hit Up, Down, Down, Right, Right, Right, Left, Left, Left, Left, 
then hold C-Up and press Start

Unlock all Characters In Multi-Player Mode 
Finish the game in easy and normal mode

Max power, sudden death, trial modes
Finish the game once in hard mode