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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.
The sixth episode, "Mine and Dine", was released on June 16, 2011, with 15 new mining-themed levels and a new Golden Egg.[41] A July 25, 2011, update would release 15 further levels,[42] and an August 25, 2011, update concluded "Mine and Dine" with the final 15 levels.[43]
The seventh update, "Birdday Party", was released on December 11, 2011, to commemorate the second anniversary of the first release of the iOS version into the iTunes App Store.[44][45] It included 15 new birthday cake-themed levels, as well as updated graphics and the addition of elements from the spin-off games, such as the scoring graphic seen in Angry Birds Rio and the introduction of "Bubbles", the Orange Bird that first appeared in Angry Birds Seasons.[46] The update was later released for Android and Microsoft Windows. The eighth update was released initially to iOS on March 20, 2012, in a lead-up to the release of Angry Birds Space. The new update included an animated tutorial, enhanced gameplay, all new UI graphics, and the first 15 levels of "Surf and Turf," the Angry Birds Facebook-exclusive episode (see below); another 15 levels were added later on August 2, 2012, with the iOS version receiving the power-ups first seen in the Facebook version.[47][48][49][50]
On October 9, 2012, the final chapter of "Surf and Turf" was released, along with a new episode called "Bad Piggies" meant to advertise the new Rovio game, Bad Piggies.[51] Another update was released on December 11, 2012, the 3rd anniversary of the game's release, with 15 new levels to "Birdday Party" and 15 new levels to "Bad Piggies".[52] The second set of 15 levels in "Birdday Party" introduced "Stella", the Pink Bird to the game. 15 final levels were later released for the "Bad Piggies" episode on March 7, 2013.[53] On the same day these final 15 levels were released, Angry Birds became "Free App of the Week" on the Apple App Store until March 14, 2013, and became an instant hit on the Top Free App charts on the App Store until March 18, 2013, when the app returned to the normal price of $0.99.[54]