Assassin's Creed

Become a deadly assassin in the Holy Land of 1191 AD in Assassin's Creed ($60/360 or PS3). Incredibly detailed with historically-accurate models of Jerusalem, Damascus, and Acre, the game features an open level design, high-concept story, and plenty of fighting — a great mix of history, intrigue, and action that should be perfect for that post-Halo 3 hangover.
