Angry Birds has been hugely popular and that too on multiple platforms. It is still the best selling game on Apple’s iOS and one of the most downloaded games on Google’s Android as well. Few months back, Rovio, the developer of Angry Birds announced that the game will be made available for Windows PC through Intel’s AppUp center, a marketplace for Windows apps. But it was not available for free though. If you are a fan of Angry Birds and like to play the full version of Angry Birds Rio on your notebook or netbook, here is the best chance to grab it for free. All you need to do is, download and install Intel AppUp center from here, Sign-up for a new account (even if you have one already) and then check the My Apps tab of AppUp for the free app! Remember, the offer is valid till September 29th only and is available for exclusively new registrations.