Heavyweight Champ is a boxing game for the Sega Master System. The gameplay likely involves classic boxing mechanics such as jabbing, hooking, and dodging. The focus is probably on strategic combat and managing stamina to defeat opponents.  While specifics on the graphics and depth of the game are limited without further investigation, it is known to have been released in Europe by Sega.  As a single-title release, it stands in contrast to the compilation packages previously mentioned, aiming to appeal to players with a specific interest in boxing video games.

Heavyweight Champ (Europe)

Hang-On (Japan)