Assassin's Creed II
Assassin's Creed II is a game that improves upon it's predecessor is almost every conceivable way. The first game was fairly renowned for it's sheer level of repetitiveness, the majority of the game being the same few quests over and over and over again. II's missions however, are much, much more varied, making this game an open world game you would actually want to continue playing. Along with general gameplay improvements and a more engaging storyline and characters, Assassin's Creed II is a must play.