Ninja Gaiden is a side-scrolling, hack & slash, platform-action video game for the Master System. 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. Tthe game was only released in Europe, Australia and other PAL territories, bearing the Ninja Gaiden label instead of the Shadow Warriors one that usually was used for the series by the time in PAL releases. (wikipedia.org)