The most successful game of the franchise is Angry Birds Space. It has been recently announced by Rovio that its game passed 50 million downloads in less than 30 days, and now it doubles that. There has been 100 million downloads of Angry Birds Space, meaning that users are still almost as excited about it as at its launch. The added physics in the game make it much more interesting and challenging. Just download the game and play it as 100 million people seem to do. From plush toys to t-shirts and all kinds of themed apparel Angry Birds craze is seen everywhere. Even Formula 1 driver Heikki Kovalainen has a helmet with the birds on it.
Source : Phonearena