All boxers - At the "Setup" menu, select the "Cheat" option, then press Start, A, Y, X(2), Z(2), X, Y, A, Start to unlock all boxers.
All boxers' Life mode - At the "Setup" menu, select the "Cheat" option, then press Start, A, X, Y, Z, A, X, Y, Z, Start.
Alternate costumes - At the "Setup" menu, select the "Cheat" option, then press Start, A, Z, Y, X, Start. Alternately, successfully complete Life mode with a boxer to unlock a new costume for that character.
Constant power-ups - At the "Setup" menu, select the "Cheat" option, then press Start, A, Y, A, Y, A, Y, X(3), Start. Note: This code can be enabled on controller one for player one or controller two for player two.
Conversation mode - At the "Setup" menu, select the "Cheat" option, then press Start, Z, A, Y, X, Z(3), Start.
Intercontinental Tournament - At the "Setup" menu, select the "Cheat" option, then press Start, A(3), Y(3), X(3), Start. Alternately, win all five default tournaments to unlock the Intercontinental Tournament.
Invincibility - At the "Setup" menu, select the "Cheat" option, then press Start, A(2), Y(2), Z(2), X(2), Start. Note: This code can be enabled on controller one for player one or controller two for player two.
Play as King Khan - Win the Top Contender Tournament to unlock King Khan.
Play as Matador - Win the Intercontinental Tournament to unlock Matador.
Play as Odive - Win the Pro Tournament to unlock Odive.
Play as Old Master - Win the World Championship Tournament to unlock Old Master.
Play as Training Robot - Successfully complete training mode to unlock the Training Robot.
Restore energy - Rapidly press A repeatedly after getting knocked down to restore a small amount of energy and help prevent a knockout.
Scrap Yard arena - At the "Setup" menu, select the "Cheat" option, then press Start, Y, Z, Y, Z, A(2), Start. Alternately, win all survival modes to unlock the Scrapyard arena.
Turbo mode - At the "Setup" menu, select the "Cheat" option, then press Start, Z(10), Start.