Black And Bruised 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.
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.
Turbo mode
At the “Setup” menu, select the “Cheat” option, then press Start, Z(10), Start.
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.
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.
All boxers’ Life mode
At the “Setup” menu, select the “Cheat” option, then press Start, A, X, Y, Z, A, X, Y, Z, Start.
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.
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.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art.