From Wikipedia, Ninja Gaiden is an action video game released for the Game Gear in 1991 by Sega with license from Tecmo. It stars Ryu Hayabusa and is part of the Ninja Gaiden series, although it features a plot not connected to any of the other Ninja Gaiden games. In this game, Ryu Hayabusa must stop an evil organisation from starting World War III after an attempt to steal his sword was made in his home village. The gameplay is similar to previous Ninja Gaiden games where the player jumps between platforms defeating and avoiding enemies. http://en.wikipedia.org/wiki/Ninja_Gaiden_(Game_Gear_video_game)