Gears of War: Over 19 Million Served
Gears of War has been around since early on in the life cycle of the Xbox 360. The first game was released in 2006, introducing the world to Marcus, Dom, and the glorious Lancer weapon. A smash hit, the original was followed up by two sequels, one in 2008 and another late last year. Each of these games took what made the first great, cranked it up a notch or three, and added in glorious features like Horde and Beast mode. Throughout the series, co-op options have been solid, culminating in four-player online campaign support in Gears of War 3. To say that it has been a successful series would be an understatement.