Gunstar Heroes is a run and gun video game developed by Treasure Co. Ltd and published by Sega. The game was released September 9, 1993 in North America and the following day in Japan for the Sega Mega Drive, with a release also following in Europe in the same year. A Game Gear version was released only in Japan in 1995. It was the best selling Mega Drive game in Japan. [source:wikipedia]