Almost two years after it came out, Bungie's Halo 3 is still going strong - with an approximate average of one million unique users playing it every day.
Week after week, we get to see what the most-played titles on Xbox Live are courtesy of Microsoft's Major Nelson. Almost invariably, the top four spots will go to Bungie's Halo 3, Epic's Gears of War 2, Infinity Ward's Call of Duty 4: Modern Warfare, and Treyarch's Call of Duty: World At War - some combination of those four, anyway.
But how many people play them? As Erik Brudvig over at IGN points out, just knowing the order doesn't mean much if we don't know the actual numbers. To shed some light on the issue, Bungie's Brian Jarrard revealed at a recent Bungie press event that there were over a million unique Halo 3 players every day.
If Halo 3 were a city, it would be the tenth biggest city in the United States, knocking San Jose down a list - that's more people than Detroit, San Francisco, or Boston.
I guess this kind of explains the whole billionth game thing.