Halo 4 is a first-person shooter developed by 343 Industries and published by Microsoft Studios for the Xbox 360 video game console. The sixth mainline installment in the Halo franchise, the game was released on November 6, 2012. Halo 4's story follows a cybernetically enhanced human supersoldier, Master Chief, and his artificial intelligence construct Cortana, as they encounter unknown threats while exploring an ancient civilization's planet. The player assumes the role of Master Chief who battles against a new remnant faction that splintered off of the Covenant, a former military alliance of alien races, and against mechanical warriors of the Forerunner empire known as the Prometheans. The game features a selection of weapons, enemies, and game modes not present in previous titles of the series.