SD Hiryuu no Ken EX is a Game Boy Color game released in Japan. The title likely refers to a variation of a fighting game, potentially featuring characters and mechanics inspired by a larger franchise.  The 'SD' could imply simplified graphics or character designs compared to console counterparts.  The gameplay would most likely involve one-on-one combat with special moves and combos, adapted for the system's capabilities. More information on its developer and precise gameplay would require further research into Japanese gaming history.

SD Hiryuu no Ken EX (Japan)

Saru Puncher (Japan)