"Call of Duty: Black Ops" shows no signs of slowing down. Game maker Activision announced Tuesday that the game has now brought in more than $1 billion in sales worldwide since its November launch.

"In all of entertainment, only 'Call of Duty' and 'Avatar' have ever achieved the billion dollar revenue milestone this quickly," Bobby Kotick, CEO of Activision Blizzard, said in a statement. "This is a tribute to the global appeal of the Call of Duty franchise, the exceptional talent at Treyarch and the hundreds of extraordinary people across our many Call of Duty studios including Infinity Ward and Sledgehammer that work tirelessly on the franchise."

To date, players have logged about 600 million hours of "Call of Duty: Black Ops" play time. Most people log on more than once a day and stay logged on for more than an hour. More than half that time is spent playing against friends, Activision said.

The game made its debut on November 9 and sold $650 million worth of games in its first five days, exceeding the previous top earner, "Call of Duty: Modern Warfare 2," which brought in $550 million during its first five days. By month's end it sold 8.4 million units.

Earlier this month, the latest version of Activision's other popular franchise, "World of Warcraft: Cataclysm," sold 3.3 million copies in 24 hours, making it the fastest-selling PC game of all time.

For more details, see PCMag's full review of "Call of Duty: Black Ops" and the slideshow below.