As if there was any doubt that Angry Birds wasn’t popular, Angry Birds 2 release came out and smashed those presumptions. Developer Rovio tweeted out a celebratory tweet when the game reached over 5 million downloads in 36 hours. Angry Birds 2 released on July 30, 2015 for iOS and Android and soon reached 1 million downloads in 12 hours.
The original Angry Birds reached 2 billion downloads as of January 2014, and with the current trajectory, it appears its sequel (actually the 12th game in the franchise) will also reach those numbers.
— Rovio (@Rovio) July 31, 2015