There was a time when 'ninja games' referred to an indomitable force of shuriken chucking momentum that was less about hiding silently in the shadows while waiting for an opportune moment to strike, and more with slicing through monstrous demons and T-800-style car wreckers.
But with the release of Acquire's stealth-based Tenchu: Stealth Assassins way back in 1998, the greatest backstabbers in history were portrayed in a darker light that was more befitting of their ethereal reputation.
Tenchu holds the distinction of being the first 3D stealth game, with a feudal Japan setting that beat both Snake and Garrett to the blackjacking punch by a matter of months. Although in more recent years the pioneering sneak 'em up has fallen from grace, that hasn't stopped Acquire from supplying ninjutsu fans with a slew of shuriken shovelling sequels - including the Shinobido conceptual spinoff series. Shinobido 2: Revenge of Zen is the third Shinobido and while it doesn't push the Vita too hard, it does offer an engaging slice of old-school shadow-dancing action.