In the Arcade mode, go to the boxer you want and press c left + c up at the same time
Contributed By: RGuevarra.
Fight with Tank Trasher
Press C-Up + C-Down + C-Left + C-Right repeatedly until Tank Trasher begins to make fun of his opponent.
Contributed By: Biospark3.
Enter into the Championship mode then go to new game, when it asks you to name your gym enter the following code
Effect Password All Boxers and All Championship Mode Boxers are Champs CHAMP Bronze Class and Kemo Claw BRONZE Gold Class GOLD Silver Class and Bruce Blade SILVER
From the main menu, choose Championship Mode. Start a new game, name your gym, choose a boxer and pick the Train Boxer option. Now highlight Rumble Aerobics Training, press Left, then quickly press A. If you did it fast enough, you will purchase the Rumble Mass Nutrition Regime (which costs $25,000) for $500! This will boost your strength and experience very quickly. You can also purchase the Sway Bag for $500 instead of $1,000 by pressing Right instead of Left.
Contributed By: aduckie.
Choose Your Corner Man
Before you select your boxer in arcade mode, hold down the Left High Punch button. When you push the D-Pad in a specific direction, you'll choose 1 of 5 cornermen. If you hold down the Left High Punch, Low Block, and High Block buttons, you'll get a high pitched version of the Irish guy. He sort of sounds like a leprechaun.
Contributed By: Ben Zetlitz.
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