It's doubtful that there will ever be a more unlikely PS3 exclusive than Ninja Gaiden Sigma - it's a remake of a game created for the original Xbox. Which may sound unpromising, but surprisingly proves to be impressive. The Xbox Ninja Gaiden was revered for its graphics, its coherent gameplay which mixed ninja-fighting and action-adventure and, most of all, its fearsome difficulty level. Ninja Gaiden Sigma will be reassuringly familiar to those who played its predecessor. It contents itself with merely tweaking gameplay and adding three chapters (in which you play a female character rather than main protagonist, Ryu). But incredible graphics - you can sense Tecmo's glee at having the PS3's power to play with - and hyper-responsive controls add up to a visual feast and a slight amelioration of the difficulty level. It still features some of the best boss-battles ever, and when you do prevail, provides serious satisfaction. A must-buy if you own a PS3.