Warner’s announced this lunchtime that shipment numbers of Batman: Arkham City have hit 4.6 million units.

The numbers, which come merely seven days after its US launch and four days after its European and UK launch, are more than double of what Arkham Asylum achieved in the same period when it released in 2009.

“The team at Rocksteady put every ounce of effort into making the best Batman experience we possibly could, so we are overwhelmed by the incredible feedback from the community,” said Rocksteady director Sefton Hill.

The London-based studio “went above and beyond in delivering an incredible game,” according to WBIE head Martin Tremblay, “and the support of the entire team at Warner Bros. Interactive Entertainment and DC Entertainment drove the excellent campaign a game like this deserves.”

Arkham City is currently sitting on a 96 for PS3 and 95 for 360 on MetaCrtic.

The PC version launches on November 18.