Final Blow, or James 'Buster' Douglas Knockout Boxing, is a Taito boxing game for the arcades and was converted for Sega Genesis featuring the short-lived heavyweight boxing champ of the world in 1990, James "Buster" Douglas. Knockout Boxing was a side-profile perspective boxing game for the Sega Genesis. The game contained both instant action matches, as well as an in-depth (for the time) career mode, where players would build up their their newly created pugilist from palooka to world champion.
Using combinations of jabs, hooks, and uppercuts, the player navigates his boxer around the ring, seeking the knockout blow. In between matches, player-created boxers improved their skills in four categories (hand speed, hitting power, stamina, defense) by selecting various training regimens available. Knockout Boxing climaxes with the player taking on Buster Douglas for the heavyweight championship. As a part of the career mode, player-created boxers' skills would degrade over time, making late-career bouts difficult when facing the new fighters coming up just as the player had. The player's career concludes with his retirement after 30 matches.
The game was renamed Heavyweight Champ for its European Sega Master System release, which was also the name of Sega's own series of boxing games and frequently carried the endorsement of another boxer: George Foreman.