Knockout Kings is a series of boxing games that were produced by EA Sports for the PSOne, Nintendo 64, PlayStation 2, Xbox, Game Boy and GameCube yearly between 1998 and 2003. Knockout Kings gives the user a chance to compete against 32 real fighters, such as Muhammad Ali, Marvin Hagler, Sugar Ray Leonard, Oscar de la Hoya, Larry Holmes, Jake LaMotta, Roberto Duran, Alexis Arguello, and Ray Mancini. In the game's "slugfest" mode, fighters can knock each other out at any given moment of the fight, or suffer 6 or 7 knockdowns and still last for the whole fight.

There are several differences between Knockout Kings and real-life boxing careers. Championship bouts are only for 10 rounds and not for 12 as in real life. In the career mode of Knockout Kings, a fighter is made to retire right after winning the title and defending it for only the first time. Also, Knockout Kings does not have women's boxing. The exception being the Playstation version of Knockout Kings 2001.

Before releasing Knockout Kings, Electronic Arts released its first 3D boxing game, Foes of Ali, for the 3D0 in 1995. While there are a few similarities between the two games, Foes of Ali was developed by a different team, Gray Matter and as such, is not regarded as a true prequel. (Wikipedia)

Passwords

Misc. Passwords
Enter the following as your name in Career Mode:

KNUCKS - Ashy Knucks

MECCA - Ashy Knucks

SANDERS - Barry Sanders

MRBARRY - Barry Sanders

OSUNA - Bernando Osuna

BAW - Black and White Boxer

HATCHER - Charles Hatcher

ZITO - Chuck Zito

EYE - Cyclops

BOSTICE - David Bostice

DEFIAGBN - David Defiagbon

DEMART - David DeMartini

RESETPASS - Disable All Cheats

DOUBLEDAMAGE - Double Damage

Bulldog - Extra Boxer

GORE - Gorilla

INVINCIBLE - Invincibility

JGIAMBI - Jason Giambi

GIAMBI - Jason Giambi

BAILEY - Joe Mesi

JBOTTI - John Botti

SEAU - Junior Seau

JRSEAU - Junior Seau

100% - Max Stats

NOLAN - Owen Nolan

OWNOLAN - Owen Nolan

BABY - Play as a Baby

CLOWN - Play as a Clown

AUSTIN - Ray Austin

THROB - Schmacko Throb

STEVEF - Steve Francis

FRANCIS - Steve Francis

BULLDOG - The Bulldog

NELSON - Trevor Nelson

SEPIA - Yellow Boxer

Hardcore boxing from the era of the PSX: