Knock Out was WELL before my time so take my opinion as a grain of salt. The gameplay is OK but the mechanical "Rock em' Sock em'" boxers and the art are top notch. I especially love the boxer on the playfield getting his face smashed in. Funny thing is I heard (Topcast interview, maybe) that the artist, Roy Parker, detested the violence of boxing and his depiction in the artwork was to display the brutal nature of it for not only the boxers, but the audience as well. Anyone else want to chime in on that, please do.