S.D. Hiryū no Ken Densetsu

Flying Dragon, known in Japan as Hiryū no Ken Twin (飛龍の拳ツイン, Hiryū no Ken Tsuin; "Fist of the Flying Dragon Twin"), is a fighting game with role-playing elements that was developed by Culture Brain and released for the Nintendo 64 in 1998. Part of the Hiryū no Ken series, it was published in Japan by Culture Brain, and by Natsume Inc. in North America and Europe. The game's SD mode features a character progression system, in which characters advance in levels as they become more experienced, and players collect credits and treasure items to equip characters with. It had a sequel a year later, titled S.D. Hiryu no Ken Densetsu.