Knockout Kings 2000 Codes -

Miniature boxers:
Enter the options screen and view the "Cyber Athlete" video sequence. Then, enter career mode and enter MINIME as a name to miniaturize all boxers. To return to normal size, enter RESETPASS as a name in career mode.

Throbbing boxer heads:
Enter THROB as a name at the boxer creation screen

Fight as Judge Mills Lane:
Enter the options screen and view the "Cyber Athlete" video sequence. Then, enter exhibition mode and intentionally get disqualified. Mills Lane will be unlocked as a middle weight boxer.

Fight as Jermiane Dupri:
Enter JERMAINE DUPRI as a name at the boxer creation screen to fight as Jermiane Dupri, the hip-hop musician. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.

Fight as Q-Tip:
Enter Q TIP as a name at the boxer creation screen to fight as Q-Tip from the band A Tribe Called Quest. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.

Fight as O:
Enter O as a name as a name at the boxer creation screen to fight as the musician that performed most of the game music. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.

Fight as Marc Ecko:
Enter MARC ECKO as a name at the boxer creation screen to fight as Marc Ecko, the founder of the Ecko line of clothes. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.

Fight as Tim Duncan:
Enter TIM DUNCAN as a name at the boxer creation screen to fight as Tim Duncan from the San Antonio Spurs. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.

Marlon Wayans:
Enter MARLON WAYANS as a name at the boxer creation screen to fight as Marlon Wayans, the comedian. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.

Gargoyle:
Enter GARGOYLE as a name at the boxer creation screen to fight as a gargoyle. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.

Alien:
Enter ROSWELL as a name at the boxer creation screen to fight as a gargoyle. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.

Shamcko The Clown:
Enter SHMACKO as a name at the boxer creation screen to fight as a gargoyle. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.

Ed Mahone:
Enter ED MAHONE as a name at the boxer creation screen to fight as Ed Mahone.

280 lb. Super Heavyweight fighter:
Select "Heavyweight" at first fighter attribute screen in career mode. Set the fighter's weight to "230" (maximum). Press X to go to second fighter attributes screen. Change the fighter's body style from "1" to "2". Press Triangle to return to first attributes screen, and the fighter's weight can now be set anywhere from 230 to 280 lbs.

Illegal kick:
Press Triangle + Circle + X + Square during a match to illegally kick your opponent in the midsection.

Illegal head butt:
Press R1 + R2 and press Triangle during a match.

Illegal low punch:
Press R1 + R2 and press X during a match.

Illegal kidney punch:
Press R1 + R2 and press Circle during a match.

Illegal elbow:
Press R1 + R2 and press Square during a match.

Get up faster:
Press Analog-stick Down + X after being knocked down to get up faster,

Keep boxer down for entire count:
Keep pressing Start while the referee is counting.

Rocky Marciano power-up:
In a Slugfest, fight as Rocky Marciano. Press Triangle + Circle and Rocky will appear to power up his gloves. His will be more powerful. Note: This effect will eventually wear off.

Evander Holyfield invincibility:
In a Slugfest, fight as Evander Holyfield. Press Triangle + Circle and he will beat his chest. This makes him invincible to most punches. Note: This effect will eventually wear off.

Hint: Faster knock outs:
At the beginning of each fight, you can land four head butts at most. Your opponent will probably be bleeding -- if not, he will get knocked out a lot faster.