Knockout Kings 2000

Note: This game is also titled Box Champions 2000.

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.
Information in this section was contributed by XJimmieX.

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.
Information in this section was contributed by megacortex.

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.

Switch from left and right hands:
Hold R1, R2, and L2 to switch from being left-handed to right-handed and vice versa.
Information in this section was contributed by DinoS2.

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.
Information in this section was contributed by Bruce Buchert.

Illegal kick:
Press Triangle + Circle + X + Square during a match to illegally kick your opponent in the midsection. Note: This move is only legal in Slugfest mode.
Information in this section was contributed by Marques M and COFFEEFREAK17.

Illegal head butt:
Press R1 + R2 and press Triangle during a match. Note: This move is only legal in Slugfest mode.
Information in this section was contributed by Big Mark and COFFEEFREAK17.

Illegal low punch:
Press R1 + R2 and press X during a match. Note: This move is only legal in Slugfest mode.
Information in this section was contributed by Big Mark and COFFEEFREAK17.

Illegal kidney punch:
Press R1 + R2 and press Circle during a match. Note: This move is only legal in Slugfest mode.
Information in this section was contributed by Big Mark and COFFEEFREAK17.

Illegal elbow:
Press R1 + R2 and press Square during a match. Note: This move is only legal in Slugfest mode.
Information in this section was contributed by Big Mark and COFFEEFREAK17.

Get up faster:
Press Analog-stick Down + X after being knocked down to get up faster,
Information in this section was contributed by Corey Willis.

Keep boxer down for entire count:
Keep pressing Start while the referee is counting.
Information in this section was contributed by Jord418.

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.
Information in this section was contributed by Michael Pugh.

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.
Information in this section was contributed by Michael Pugh.

Hint: Extra training points:
When you hear the bell in training mode, press Start then throw in the towel.
Information in this section was contributed by DogThief4.

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.
Information in this section was contributed by Paul O'Faolain.

When you are about to knock down your opponent, hold the button of the last punch you throw. You will remain still. When your opponent is about to get up, hit him with another punch and he will fall down again.
Information in this section was contributed by DogThief4.