"Halo Killer" has become part of the gaming industry lexicon, a pipe dream floated by every wannabe developer hoping to make their bones by taking top honors away from the most successful first person shooter of all time. It'll be a tough climb. As a series, Halo has sold more units faster than any other game in history. Over five billion matches have been played online. Dozens of awards. Hundreds of accolades. Halo was itself a game-changer, simultaneously putting a new and untested console on the map while announcing the end of PC-shooter dominance with authority.