Ninja Gaiden games have gone from the arcade ... and boss battles when they're given an opening. A large, spiked club weapon ...

Different weapons were originally assigned to each Teenage Mutant Ninja Turtle for easy identification in early designs.

He added that the forms of these primitive tools suggest that they may have been the prototypes of shuriken and other weapons used by the feudal-era undercover agents. Yuji Yamada, a ninja expert ...