If ever there were a nearly perfect example of a sequel done right, it's Assassin's Creed 2. The first game was a revelation of open world exploration and mobility, with an amazing historical setting and immense world to explore. Unfortunately, as riveting an experience as it was, there just wasn't enough to do. The sequel takes care of this problem quite handily. While keeping the original idea of a well-developed, fascinating historical setting, the sequel improves on almost every other front.