minimal:
reqprocessor: Intel i3-3225 3.3ghz
reqgraphics: NVIDIA 650 (1GB), AMD R9 270 (2GB) or better
reqmemory: 4 GB RAM
reqdiskspace: 45 GB available space
reqsystem: Ubuntu 14.04.2 64-bit or Steam OS
reqother: Initial installation requires one-time Internet connection for Steam authentication; software installations required (included with the game) include Steam Client, Microsoft Visual C++2012 and 2013 Runtime Libraries and Microsoft DirectX.

recommended:
reqprocessor: Intel i7 series
reqgraphics: NVIDIA 960 (2GB)
reqmemory: 8 GB RAM
reqdiskspace: 45 GB available space
reqsystem: Ubuntu 14.04.2 64-bit or Steam OS
reqother: Initial installation requires one-time Internet connection for Steam authentication; software installations required (included with the game) include Steam Client, Microsoft Visual C++2012 and 2013 Runtime Libraries and Microsoft DirectX.