Angry Birds (video game) was being played, the staff liked the characters, and the team elected to design a game around them. In early 2009, physics games, such as "Crush the Castle", were popular flash-based web games, so the Rovio team was inspired by these games. During the development of "Angry Birds", the staff realized the birds needed an enemy. At the time, the "swine flu" epidemic was in the news, so the staff made the birds' enemies pigs. Angry Birds was the studio's 52nd produced game and on its initial release, the game did not sell many copies. After Angry Birds was a
Angry Birds Rio issue with the new boss battles, calling them "a little anti-climactic". Tracy Erickson of "Pocket Gamer" noted that "what Angry Birds Rio lacks in new ideas and freshness, it makes up in quality gameplay and good value". Since release, "Angry Birds Rio" has been downloaded more than 10 million times, and it has been one of the top downloaded games at both the Apple App Store and Google Play. Angry Birds Rio Angry Birds Rio is the third puzzle video game in the "Angry Birds" series, developed and published by Rovio Mobile. Based on "Angry Birds", "Angry Birds Rio" was