minimal:
reqprocessor: Intel Core i3-4130T 2.90GHz, AMD FX6300
reqgraphics: The game requires a 1GB NVIDIA 650ti graphics card or better, 1GB AMD R9 270 or better, Intel Iris Pro 6200 or better.
reqmemory: 8 GB RAM
reqdiskspace: 42 GB available space
reqsystem: Ubuntu 16.10 (64bit) or SteamOS (2.0 : 2.110)
reqother: NVIDIA cards require driver version 370.28 (tested). AMD GPU's require MESA 13.0.3 or better (tested). Intel GPU's require MESA 13.0.3 or better (tested).

recommended:
reqprocessor: Intel Core i5-6500 3.20GHz
reqgraphics: We recommend a 4GB NVIDIA 970 graphics card or better.
reqmemory: 8 GB RAM
reqdiskspace: 42 GB available space
reqsystem: Ubuntu 16.10 (64bit) or SteamOS (2.0 : 2.110)
reqother: NVIDIA cards require driver version 370.28 (tested). AMD GPU's require MESA 13.0.3 or better (tested). Intel GPU's require MESA 13.0.3 or better (tested).