Knockout Kings 2000 cheats and cheat codes for Nintendo 64

Enable giant head mode
Pause the game play and hit C-Left, C-Right, C-Left, C-Left, C-Right. 
You should hear a bell ring, if the code is accepted. If you want 
to disable the cheat effect, simple re-enter the code.

Enable giant gloves mode
Pause the game play and hit C-Up, C-Down, C-Up, C-Up, C-Down.
You should hear a bell ring, if the code is accepted. If you want 
to disable the cheat effect, simple re-enter the code.

Restore energy
Do not move the Analog-stick, but press Z several times

Easy knockdown
Maximalize your meter, then hit R + L + A or B