https://store.steampowered.com/app/1108000
http://store.steampowered.com/app/292910
http://store.steampowered.com/app/214340
http://store.steampowered.com/app/220740
http://store.steampowered.com/app/241910
Steam account required for game activation and installation
Windows System Requirements:
MINIMUM:
OS: Windows Vista SP1
Processor: 2 GHz Dual Core CPU
Memory: 2 GB RAM
Graphics: ATI Radeon HD 3400 Series, Geforce 9400 Series with at least 512 MB VRAM
DirectX: 9.0c
Storage: 3200 MB available disk space
Sound Card: DirectX 9.0c compatible sound card with latest drivers
RECOMMENDED:
OS: Win 7, 8, 10
Processor: 2.6 GHz Dual Core CPU
Memory: 3 GB RAM
Graphics: ATI Radeon HD 4500 Series, Geforce 9400 GT or higher
DirectX: 9.0c
Storage: 3200 MB available disk space
Sound Card: DirectX 9.0c compatible sound card with latest drivers
Mac System Requirements:
MINIMUM:
OS: Mac OSX 10.7
Processor: Intel 2 GHz Dual Core CPU
Memory: 2 GB RAM
Graphics: ATI Radeon HD 4850 Series, Geforce 130 Series with at least 512 MB VRAM
Storage: 3200 MB available disk space
Sound Card: 16 bit
RECOMMENDED:
OS: Mac OSX 10.11
Processor: Intel 2.7 GHz Dual Core CPU
Memory: 4 GB RAM
Graphics: ATI Radeon HD 6970 Series, Geforce 640M GT or higher
Storage: 3200 MB available disk space
Sound Card: 16 bit
Linux System Requirements:
MINIMUM:
OS: Ubuntu 12.04 (64 Bit only)
Processor: 2 GHz Dual Core CPU
Memory: 2 GB RAM
Graphics: Geforce 9400 Series, ATI Radeon HD 4500 Series with at least 512 MB VRAM and proprietary drivers, latest OpenGL driver
Storage: 3200 MB available disk space
Sound Card: Sound Card with latest drivers
RECOMMENDED:
OS: Ubuntu 14.04 (64 Bit only)
Processor: 2.6 GHz Dual Core CPU
Memory: 3 GB RAM
Graphics: ATI Radeon HD 5600 Series, Geforce 9400 GT or better with proprietary drivers
Storage: 3200 MB available disk space
Sound Card: Sound Card with latest drivers