This seems like the big “Black Friday deal” for Windows Phone users from Rovio. As, you can see in the above screenshot, all the Angry Birds titles are available for free in the Windows Phone store. The only title from Rovio, which has not gone free is Amazing Alex.
So, if you are a Angry Birds fan, rush and grab your favorite titles, before the deal ends.
Thanks Naveen for the tip. Cheers!!