This unreleased game in the Ninja Gaiden series features beat 'em up gameplay similar to the Streets of Rage games and the arcade version of Ninja Gaiden.
Seven stages are present in the prototype build leaked online, along with some boss battles and cutscenes with English text. Available moves include a standard punch combo, a jump kick, a rolling move, a special somersault kick, and a throw. Some of the controls are bugged and some cutscenes automatically skip, which might actually be good for a TAS.