12 is Better Than 6 Minimum System Requirements:
OS: Windows Vista / Windows 7 / Windows 8.1
Processor: Intel Pentium 2.9 Ghz or equivalent
Memory: 2048 MB RAM
Graphics: 512 Mb DirectX 9 compatible video card with shader model 3.0 support
DirectX: Version 9.0c
Storage: 300 MB available space

12 is Better Than 6 Recommended System Requirements :

Activation on Steam

1)      Download & install the Steam client on your computer from   here.

2)      Open the Steam client, register and login. Then, locate the Games tab on the top menu. Click that and select “Activate a Product on Steam..”

       

3)      Enter your code that is showed on the orders page of eTail. Market and and follow the steps showed to activate your game.

       

4)      The game can be monitored now and you can see it on the "Library" section on Steam. You can download and install the game now.

5)      If you need more information and support, you can click here: https://help.steampowered.com/en/wizard/HelpWithSteam