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 (video game) features not available on the smartphone versions. One day after the Windows version was released, the Mac App Store launched, with one of the first offerings being its own version of "Angry Birds". Ports of "Angry Birds" have also been proposed for the Wii and Nintendo DS systems, with the former becoming realized through "Angry Birds Trilogy" (see below). A 3D-enhanced version of the game was proposed for release on the LG Optimus 3D in October 2011. The popularity of "Angry Birds" has helped spread the game to other devices that were not initially designed as gaming machines. Barnes &