*Sega Genesis and Sega Megadrive Game Cheats
Genesis is the US name for the console and MegaDrive the Euro name..
Greatest Heavyweights

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Courtesy of: Gamefaqs.com

BUTTON CHEATS

INVINCIBLE
During the Introduction, press:
B, B

ONE PUNCH WONDER!
With this cheat you will be able to knock out your opponent with the first punch.
During the Introduction, press:
C, C
You'll knock out your opponent on the first punch

Submitted by: AJ

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*Please note: In the US and some other regions this system is known as the Sega Genesis. In other regions, including Japan and Europe, the console is known as the Sega Mega Drive.