NPD Group Inc. this week said Portal 2 as the No. 2 title in U.S. game sales.
The Portal 2 PS3 SKU allows owners to link their Steam and Playstation Network accounts to facilitate cross-platform play between users via the PS3, PC or Mac.
Additionally, the Portal 2 PS3 SKU includes cloud-based storage to allow users to play and continue from the PS3, PC or Mac.
Portal 2 is an action puzzle sequel to the 2007 release Portal.
The final game includes platform and physics-based puzzles, in addition to a two-player co-op mode.