System: Windows
OS: Windows 7
Processor: Dual core CPU 2.4 GHz
Memory: 4 GB RAM
Graphics: GeForce GTS 450-class (Intel HD 4000)
Hard Drive: 3 GB available space

System: Mac
OS: Mac OS X 10.9 (Mavericks)
Processor: Dual core CPU 2.4 GHz
Memory: 4 GB RAM
Graphics: GeForce GTS 450-class (Intel HD 4000)
Hard Drive: 3 GB available space

System: Linux
OS: Linux Ubuntu 12.04
Processor: Dual core CPU 2.4 GHz
Memory: 4 GB RAM
Graphics: GeForce GTS 450-class (Intel HD 4000)
Hard Drive: 3 GB available space
Additional Notes: recent binary ATI or NVidia drivers (MESA may not work reliably)

Activation: Go to: http://store.steampowered.com/ and download STEAM client Click "Install Steam" (from the upper right corner) Install and start application, login with your Account name and Password (create one if you don't have). Please follow these instructions to activate a new retail purchase on Steam: Launch Steam and log into your Steam account. Click the Games Menu. Choose Activate a Product on Steam... Follow the onscreen instructions to complete the process. After successful code verification go to the "MY GAMES" tab and start downloading.

Supported Languages:
German
English
French
Spanish
Czech
Danish
Dutch
Hungarian
Japanese
Polish
Portuguese
Russian
Swedish
Chinese
Bulgarian
Finnish
Norwegian
Greek
Korean
Turkish
Italian
Portuguese - Brazil
Romanian