Time Warner and subsidiary publisher Warner Bros. revealed that Batman: Arkham City, the action adventure released under the company's publishing arm, is still selling rather well and has currently shipped 6 million units worldwide since the game's release back in October 2011.

GSpot reports: "Time Warner's Filmed Entertainment business, which houses its game development unit, saw revenues rise 9 percent to $12.6 billion during its fiscal year ended December 31, 2011. The company said revenues benefited from a "stronger" game release slate and called out the aforementioned Batman: Arkham City, as well as Mortal Kombat and "several" Lego titles as "key" contributors to its bottom line. The company has not revealed specific sell-through figures for the Caped Crusader title, but the first-week shipment tally for the game stood at 4.6 million. The NPD Group placed the game as the seventh-best selling title at US retailers in 2011."

Yep, the franchise is doing pretty good.

Check out our reviews of Batman: Arkham Asylum and Batman: Arkham City.