Enter "GOLD" as a Gym name in Championship mode. Exit Championship mode and enter Arcade mode to unlock Nat Daddy. (Cheat also unlocks Kemo Claw and Bruce Blade.)

Enter "SILVER" as a Gym name in Championship mode. Exit Championship mode and enter Arcade mode to unlock Bruce Blade. (Cheat also unlocks Kemo Claw.)

Acquire the letters "R-U-M-B-L-E" during a round. Then press A + B to initiate the fighter's Rumble combination. (Note: For additional potency, press down-C + right-C while in Rumble mode.)

To earn a bonus character, you must win the title fight for either the Gold, Silver or Bronze belt. Thereafter, a new character will be selectable in both Championship and Arcade modes.

In championship mode name your gym "bronze" and you will have everyone at the bronze level. You will also have Kemo Claw in Arcade mode.

Press C-Up + C-Left at the character selection screen to change a boxer's outfit. (Note: Cheat also changes their intro and ending sequence.)

Repeatedly press C-Up + C-Down + C-Left + C-Right until Tank begins to make fun of his opponent.

Enter "CHAMP" as a Gym name in Championship mode. Exit Championship mode and enter Arcade mode to unlock Damien Black. (Cheat also unlocks Kemo Claw, Bruce Blade and Nat Daddy.)

Enter "BRONZE" as a Gym name in Championship mode. Exit Championship mode and enter Arcade mode to unlock Kemo Claw.

During a match just hold in C-up and C-right, or C-down and C-left and the boxer will taunt the opponent.

Cheap vitamins and other items Train your boxer in Championship mode. At the aerobics screen, press L and immediately press A before the screen scrolls to the other training regimen. If done correctly, you will purchase $25,0000 vitamin bottle for $500, the price of aerobics training. By pressing L or R and then immediately pushing A, you can buy other items at the next screen's prices. However, the vitamins offer the best savings.