Knockout Kings features 38 professional boxers with motion capture animation.

[2] The game also had exclusive rights for boxers Muhammad Ali, Evander Holyfield, Sugar Ray Leonard and Oscar De La Hoya.

[5] Next Generation said, "Ultimately, the game tries very hard to capture the authenticity of the sport, and it is noteworthy that it is the first to present multiple weight classes.

It seems fitting the only boxer EA didn't license for Knockout Kings (other than [Mike] Tyson) was Marlon Brando's character from the film On the Waterfront.

'"[2] GamePro, however, said, "An exciting, fun, and competitive game, Knockout Kings will have you out of your seat cheering and talking smack – even during one-player bouts.