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Chillingo claimed to have participated in final game polishing, such as adding visible trajectory lines, pinch to zoom, pigs' grunts, birds' somersaults on landing.[24] Since then Rovio has self-published almost all of the later ports of the game, with the exception of the PSP version, which was produced under license by Abstraction Games.
When Rovio began writing new versions of the game for other devices, new issues came to light. As the team began working on a version for Android systems, they observed a large number of configurations of device types and versions of the Android software.[16] The number of combinations of software version, processor speed and even user interfaces was significantly larger than that for the iOS version.[25] Ultimately, the team settled on a minimum set of requirements,[16] even though that left nearly 30 types of Android phones unable to run the game, including some newly released phones.[25] It was released on October 15, 2010. One month after the initial release on Android, Rovio Mobile began designing a lite version of the game for these other devices.[25]
In early 2010, Rovio began developing a version of Angry Birds for Facebook.[26] The project became one of the company's largest, with development taking over a year.[26] The company understood the challenges of transplanting a game concept between social platforms and mobile/gaming systems. In a March 2011 interview, Rovio's Peter Vesterbacka said, "You can’t take an experience that works in one environment and one ecosystem and force-feed it onto another. It's like Zynga. They can’t just take FarmVille and throw it on mobile and see what sticks. The titles that have been successful for them on mobile are the ones they’ve built from the ground up for the platform."[26] The Facebook version incorporate social-gaming concepts and in-game purchases and entered beta-testing in April 2011;[26] the game became officially available on Facebook in February 2012 as Angry Birds Facebook (later Angry Birds Friends).[27]
Improvements for the game include the ability to synchronize the player's progress across multiple devices; for example, a player who completes a level on an Android phone can log into their copy of the game on an Android tablet and see the same statistics and level of progress.[28]
The initial iOS version of the game, which soft launched in Finland on December 1, 2009, and released internationally 10 days later, included a single episode entitled "Poached Eggs" which contained three themed chapters, each with 21 levels. From time to time, Rovio has released free upgrades that include additional content, such as new levels, new in-game objects and even new birds. As updates have been released, they have been incorporated into the game's full version offered for download from each platform's application store.[29]
The first update released on February 11, 2010, added a new episode called "Mighty Hoax", containing two new chapters with 21 levels each. Updates released on April 6, 2010, added the "Golden Eggs" feature, which placed hidden golden eggs throughout the game that would unlock bonus content when found, and a new episode called "Danger Above", which initially contained a single chapter of 15 levels, released on April 23 under version 1.3.0.[30] Two later updates (released as version 1.3.2 on May 18, 2010, and version 1.3.3 on June 22, 2010, respectively[30][31][32]) added two more chapters to "Danger Above", each with 15 levels. "The Big Setup" episode, released on July 16, 2010, as version 1.4.0, added a new chapter with 45 levels and additional Golden Egg levels.[30][33]
A fifth episode, called "Ham 'Em High", launched on December 23, 2010, in celebration of the game's first year in the iOS App Store.[29][34] "Ham 'Em High" contained 15 American Old West-themed levels in a single chapter;[35] updates on February 4, 2011[36][37] and March 17, 2011[38][39] each added one new 15-level chapter. "Ham 'Em High" also introduced the Mighty Eagle, a new bird that may be used once per hour to clear any uncompleted levels.[35] The Mighty Eagle can also be used in previously completed levels, without the once-per-hour limit, to play a mini-game called "Total Destruction" in which the player attempts to destroy as much of the scenery as possible, both with the standard birds and the Mighty Eagle, achieving 100% destruction earns the player a Mighty Eagle feather for the level.[35]
The Mighty Eagle is offered as a one-time, in-game purchase,[29] and was initially only available for iOS, as its App Store customers have iTunes accounts with pre-linked credit cards.[40] In late 2011, Rovio also added the Mighty Eagle to the Chrome App version of the game. Rovio has begun testing an Android update called the "Bad Piggy Bank" with the Elisa wireless service in Finland and T-Mobile, which allows users to charge in-app purchases, such as the Mighty Eagle, to their mobile phone bills.[40] The service went live on Android with the release of version 2.2.0 in August 2012, using Google Play's transaction system, which allows both mobile billing and credit cards, allowing both Android phones and WiFi-only tablets to unlock the features. This version also added the powerups from the Facebook version and added an option to pay to remove ads, allowing Android players to enjoy the game ad-free as iOS players do.