Angry Birds (video game) featured app on the UK App Store in February 2010 and quickly reached No.1 there, it reached the No. 1 spot on the paid apps chart in the US App Store in the middle of 2010 and then stayed there for 275 days. The initial cost to develop "Angry Birds" was estimated to exceed €100,000, not including costs for the subsequent updates. For the iOS version, Rovio partnered with distributor Chillingo to publish the game to the App Store. Chillingo claimed to have participated in final game polishing, such as adding visible trajectory lines, pinch to zoom, pigs' grunts, birds'
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