Final Fantasy. Sonic the Hedgehog. Super Mario. Half-Life. Metal Gear. Halo. Resident Evil. Kirby. Call of Duty. Dragon Quest. Diablo. Gran Turismo. Ask a gamer what video game series is their favourite, and you'll often hear them name one of the above, along with a multitude of other diverse answers. One series that, for reasons I cannot understand, seems to get overlooked, even though many of the entries in the series are among the best of the genre on their respective platforms. The series to which I am referring is none other than Ninja Gaiden.