Windows
OS: Windows 7 64bit Edition Processor: Intel Core 2 Quad Q9550 running at 2.83GHz or AMD Phenom II X4 945 running at 3.00Ghz Memory: 6 GB RAM Graphics: Nvidia GeForce GTX 570 or ATI Radeon HD 7870 DirectX: Version 11 Network: Broadband Internet connection Hard Drive: 30 GB available space Sound Card: DirectX 11 Compatible sound card Additional Notes: Broadband internet connection is required for Co-op play.