The following are known Action Replay Codes for Knockout Kings 2001 on Sony Playstation (PS1).

The codes should work with the region specified but may work for other regions as well.

Device Compatibility: Action Replay, CodeBreaker & GameShark

Hit L2 to End Round
d0127a8afeff
80121abc0000

Inf. Creation Pts
800ed0ee03e7

Quick Count
800e9fa8000a

No Count
800e9fa80000

Hold X for Rapid Recovery
d0127a8abfff
80127b220002