Sega Genesis and Mega Drive
Genesis is the US name for the console and MegaDrive the Euro name..
Greatest Heavyweights

Walkthroughs and Guides
Outside link to all the information you'll need on this game, and more!
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.