So it was with considerable pride that Activision's wholly owned Infinity Ward studio told me Tuesday that its war game, Call of Duty 4: Modern Warfare, has just sold its 10 millionth copy.

Infinity Ward studio head Vince Zampella didn't know exactly how many units the game had sold on each platform it is available on--the Xbox 360, PlayStation 3, and PC--but did say that COD 4 had been most successful on the Xbox.

These days, monster hits like Grand Theft Auto IV and Halo 3 have gotten most of the media's attention for best-sellers, but by reaching 10 million sold, there's no doubt that COD 4 deserves to be mentioned in the same breath as any other title.

And to be sure, it's not the only game that has reached 10 million units moved--Infinity Ward said that COD 4 is one of "less than 10" games to do so since 2000--but it's still a notable milestone, especially when you consider that, at a sticker price of $60 a pop, even when considering that you can buy it for less at some retailers, Activision has raked in many hundreds of millions of dollars with the game.