Halo 4 may not have been as successful as the new Call of Duty: Black Ops II, to give an example, but keep in mind that the game was only released on the Xbox 360 and still had a good number of sales and still has it. But what stands out here is the great success that has actually had the complete saga of Halo, as Microsoft announced that among the various securities that make it already managed to sell 50 million units.
Another thing to mention...
