Linux
Business Model Attribute Image Commercial
Minimum RAM Required Attribute Image 2 GB
Drivers/APIs Supported Attribute Image OpenGL
Media Type Attribute Image Download
Input Devices Supported Gamepad, Attribute Image Keyboard, Attribute Image Mouse
Multiplayer Options Attribute Image Internet
Multiplayer Game Modes Attribute Image Co-Op
Steam Achievements, Cloud, Trading cards, Valve Anti-Cheat System (VAC), Workshop

Macintosh
Business Model Attribute Image Commercial
Minimum CPU Class Required Intel Core Duo
Minimum OS Class Required Attribute Image Mac OS X 10.6.4
Media Type Attribute Image Download
Input Devices Supported Joystick (Analog), Joystick (Digital), Attribute Image Keyboard, Attribute Image Mouse
Additional Hardware Required Attribute Image 3D Accelerator Required
Multiplayer Options Attribute Image Internet, Attribute Image LAN
Multiplayer Game Modes Attribute Image Bots, Attribute Image Co-Op, Attribute Image Team
Number of Offline Players Attribute Image 1 Player
Number of Online Players 8 Players
Steam Achievements, Cloud, Cross-platform, Leaderboards, Steam account required, Trading cards, Workshop

Windows
Business Model Attribute Image Commercial
Minimum CPU Class Required Pentium 4
Minimum OS Class Required Attribute Image Windows 2000
Minimum RAM Required Attribute Image 1 GB
Minimum DirectX Version Required DirectX 9.0
Drivers/APIs Supported Direct3D, Pixel Shader 2.0
Media Type Attribute Image Download, Attribute Image DVD-ROM
Minimum DVD-ROM Drive Speed Required 8X
Minimum Video Memory Required 128 MB
Video Modes Supported Full screen, Window, WUXGA (1920*1200)
Input Devices Supported Joystick (Analog), Joystick (Digital), Attribute Image Keyboard, Attribute Image Mouse
Additional Hardware Required Attribute Image 3D Accelerator Required
Multiplayer Options Attribute Image Internet, Attribute Image LAN
Multiplayer Game Modes Attribute Image Bots, Attribute Image Co-Op, Attribute Image Team
Number of Offline Players Attribute Image 1-8 Players
Number of Online Players 8 Players
Steam Achievements, Cloud, Cross-platform, Leaderboards, Steam account required, Trading cards, Workshop

Xbox 360
Media Type Attribute Image DVD-ROM [DEPRECATED]
Video Modes Supported Attribute Image HDTV 1080i, Attribute Image HDTV 1080p, Attribute Image HDTV 720p
Sound Capabilities Attribute Image Dolby Digital
Multiplayer Game Modes Attribute Image Bots, Attribute Image Co-Op, Attribute Image Team
Number of Offline Players Attribute Image 1 Player
Number of Local Players via System Link / LAN Cable Attribute Image 2-4 Players
Number of Online Players 4 Players
Number of Players: Co-Op Attribute Image 2 Players
Xbox/Windows Live Attribute Image Achievements, Attribute Image Content Download, Online Multiplayer, Scoreboard/Leaderboard, Attribute Image Voice Chat
Miscellaneous Attributes System Link
Notes 1 MB to save game


Technical information contributed by havoc of smeg (22291), Foxhack (23141), jaXen (162925), Terok Nor (26599), formercontrib (159506), Yearman (23555) and Sicarius (61655)