It's been less than a day since Rovio launchedon mobile devices, PC, and Mac, and already the title has become the top selling and highest grossing app on the iTunes App Store.With this rapid success,has also usurped Zynga's recently acquired, which was the previous leader on the paid app chart (but not the top grossing chart).Zynga purchased bothand developer Omgpop for $210 million just yesterday, and thus the social gaming giant has had very little time to enjoy the app's reign as number one. With Zynga and Rovio now going head to head, analysts have noted that both companies will have quite the competition on their hands.Given Rovio's previous success on mobile platforms, the newtitle has an impressive pedigree to help boost its popularity. In total, theseries has seen more than 700 million downloads since its debut in 2009.In addition,promises the most significant changes to the series to date, adding zero-gravity stages, new items, and more., on the other hand, only became viral hit within the last few weeks, and is Omgpop's first game to find such wild success. With Zynga now backing the title, however, it has plenty of resources at its disposal to attract new players and maintain a top position on the charts.is now available to download on iOS, Android, Mac, and PC, whileis available on iOS, Android and Facebook.