Angry Birds has grown rapidly since the launch of the original iOS app back in 2009. In the past years, they have expanded to offer the popular game on Android devices, Windows Phones, the Chrome browser, on select Roku devices and the Mac App Store. Due to a special promotion,Windows Phone users can now download the Angry Birds title completely free of charge until May 15th.

Have you already beat the original? No worries, Rovio has updated the original Angry Birds title and revamped it to include over 100 brand new levels (400 levels total) and relaunched this version as a completely separate application. The Windows Phone 8 version also includes Xbox Live integration with brand new achievements and leader-boards built directly into the mobile app. Don't worry, downloading the new version will not overwrite any of your original stats or progress, so head on over to the Windows Phone app store and get your hands on this freebie while you still can!

Via: Engadget
Source: Roxio