Windows Minimum Requirements:

• OS *:Windows Vista
• Processor:2 GHz Dual Core
• Memory:2 GB RAM
• Graphics:NVIDIA GeForce 8600 GT / ATI Radeon HD 2600 XT or greater
• DirectX®:9.0
• Hard Drive:20 GB HD space
• Sound:DirectX Compatible
• Other Requirements:Broadband Internet connection
• Additional:Initial installation requires one-time internet connection for Steam authentication; software installations required (included with the game) include Steam Client, Visual C++ 2008 Redistributable, DirectX and Microsoft .NET 4.

Windows Recommended Requirements:

• OS *:Windows 7
• Processor:2 GHz Dual Core (Intel Core 2 Duo 2.4 GHz or Athlon X2 2.7 GHz)
• Memory:4 GB RAM
• Graphics:NVIDIA GeForce 9000 series / ATI Radeon HD 3000 series or greater
• DirectX®:9.0
• Hard Drive:20 GB HD space
• Sound:DirectX Compatible
• Other Requirements:Broadband Internet connection
• Additional:Initial installation requires one-time internet connection for Steam authentication; software installations required (included with the game) include Steam Client, Visual C++ 2008 Redistributable, DirectX and Microsoft .NET 4.

Linux Minimum Requirements:

• OS: Ubuntu 14.04 (64 bit required)
• Processor: 2GHz
• Memory: 4GB Memory
• Graphics: 512MB*
• Hard Drive:16GB HD space
• Other Requirements: Nvidia 600 series+, AMD 6000 series+, Intel Iris Pro.
• IMPORTANT: Requires 64bit OS to play.

Linux Recommended Requirements:

• OS: Ubuntu 14.04 (64 bit required)
• Processor: 3 GHz
• Memory: 8GB Memory
• Graphics: 1GB*
• Hard Drive: 16GB HD space
• Other Requirements: Nvidia 700 series+, AMD 6000 series+
• IMPORTANT: Requires 64bit OS to play.