Note: This game comes with Trading Cards!
This giveaway requires an extension to be installed to your browser, a Steam account, a Twitter account and a Facebook account.
First of all, you have to install their extension, and log in with your Steam account.
Then you should do various steps, before you can get access to your Steam Key.
If you are done with all of them, fill the captcha, and here ya go! Your Free Key is right there!