Steam account required for game activation and installation The Multiplayer feature for this content requires a Paradox Account in order to play PC System Requirements MINIMUM: OS: Windows 7 x86 or newer Processor: Intel Core 2 Quad 9400 @ 2.66 Ghz / or AMD Athlon II X4 640 @ 3.0 Ghz Memory: 2 GB RAM Graphics: NVIDIA® GeForce X 460 with 1024MB VRAM / or AMD HD 5770 (Latest available WHQL drivers from both manufacturers) DirectX: Version 9.0c Network: Broadband Internet connection Storage: 4 GB available space Sound Card: Direct X- compatible sound card Additional Notes: Controller support: 3-button mouse, keyboard and speakers. Special multiplayer requirements: Internet Connection or LAN for multiplayer. Mac System Requirements MINIMUM: OS: OS X 10.8.5 or newer Processor: Intel Core i5 @ 2.5Ghz Memory: 4 GB RAM Graphics: NVIDIA GeForce 320 or higher with 1024MB VRAM / or ATI Radeon HD 6750 with 1024 VRAM Storage: 4 GB available space Additional Notes: Controller support: 3-button mouse, keyboard and speakers. Special multiplayer requirements: Internet Connection or LAN for multiplayer. Linux System Requirements MINIMUM: OS: Ubuntu 14.04 x86 Processor: Intel Core 2 Quad 9400 @ 2.66 Ghz / or AMD Athlon II X4 640 @ 3.0 Ghz Memory: 2 GB RAM Graphics: Nvidia GTX 460 with 1024MB VRAM / or AMD HD 5770 with 1024 VRAM , shader model 3 required. (Latest available proprietary drivers from both manufacturers) Storage: 4 GB available space Additional Notes: Controller support: 3-button mouse, keyboard and speakers. Special multiplayer requirements: Internet Connection or LAN for multiplayer. Language Support: English, German, French, Spanish, Polish, Brazilian-Portuguese, Russian