Nekketsu Kakutō Densetsu (熱血格闘伝説 lit. "Hot Blooded Fighting Legend") is a 1992 tournament-style fighting game developed and published by Technōs Japan exclusively in Japan for the Family Computer on December 23, 1992. It is a spin-off of the Kunio-kun series, as well as Technōs Japan's first attempt in the genre since their port of their Double Dragon arcade game on the same platform. Technōs Japan later became better known for the 1995 Double Dragon fighting game and the 1996 Voltage Fighter Gowcaizer.
It is also the first fighting game to allow up to four players to play simultaneously against each other. In order for more than two players to play, a multitap (like the 4-Players Adaptor by Hori) is required.
Source: Wikipedia, "Nekketsu Kakutō Densetsu", available under the CC-BY-SA License.