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The game received average reviews according to the review aggregation website GameRankings. 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 Tyson) was Marlon Brando's character from the film On the Waterfront. Like Brando's character, this game 'could've been a contender.'" 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. Buying the game's not only cheaper than most boxing pay-per-views, but a lot more entertaining."
Notes
Four critics of Electronic Gaming Monthly gave the game each a score of 8/10, 7/10, 5/10, and 8.5/10.
GamePro gave the game two 5/5 scores for graphics and fun factor, 4/5 for sound, and 4.5/5 for control.
Dean Hager; John Ricciardi; John Davison; Ken "Sushi-X" Williams (January 1999). "Knockout Kings" (PDF). Electronic Gaming Monthly. No. 114. Ziff Davis. p. 226. Archived (PDF) from the original on March 27, 2023. Retrieved August 31, 2023.
Ryan MacDonald (December 1, 1998). "Knockout Kings Review". GameSpot. Fandom. Archived from the original on January 4, 2005. Retrieved August 31, 2023.