Requirements

Mac

Minimum Requirements
OS
Mac OS X 10.10.5
Processor
Intel 1.8 GHz
RAM
4GB
Hard Disk
18GB
Graphics
512MB
Input
Keyboard & Mouse
Recommended Requirements
OS
Mac OS X 10.11.5 or higher
Processor
Intel 2.4 GHz
RAM
8GB
Hard Disk
18GB
Graphics
1GB
Input
Multi-button Mouse

The following graphics cards are not supported: ATI X1xxx series, ATI Radeon HD2xxx series, Intel GMA series, Intel HD5300, Intel HD3000, Nvidia 7xxx series, Nvidia 3xx series, Nvidia 9xxx series and Nvidia 8xxx series. The following cards require you to have 8GB of System RAM: Intel HD 515 and Intel HD4000.

This game is not currently supported on volumes formatted as Case-sensitive.

Linux

Minimum Requirements
OS
Ubuntu 16.04 (64bit), Steam OS (2.0 : 2.87) (64bit)
Processor
Intel 2.0 GHz
RAM
4GB
Hard Disk
8GB
Graphics
1GB Nvidia 6xx series or better, 1GB AMD 6xxx series or better, 1GB Intel Iris Pro series or better
Input
Keyboard & Mouse
Recommended Requirements
OS
Ubuntu 16.04 (64bit), Steam OS (2.0 : 2.87) (64bit)
Processor
Intel 2.0 GHz
RAM
4GB
Hard Disk
8GB
Graphics
2GB Nvidia 7xx series or better, 2GB AMD Radeon R9 series or better
Input
Multi-button Mouse

NVIDIA cards require driver version 367.35 (tested). AMD and Intel GPUs require MESA 11.2 (tested)