We"re a year and a half removed from Call of Duty 4, and on the verge of a true sequel to boot. But the shooter that has largely defined a generation is still going strong, with Infinity Ward revealing that Xbox Live alone has 13 million unique players.

"The thing we learned the most probably is how much focus goes into multiplayer," Infinity Ward"s Robert Bowling told Major Nelson on his podcast.

"I mean Call of Duty 4 on Xbox Live just exploded. Right now we"re 13 million unique users on 360, and that"s insane."