There have been free upgrades released by Rovio:'Poached Eggs''Mighty Hoax''Danger Above''The Big Setup''Ham 'Em High''Mine and Dine''Birdday Party''Bad Piggies''Surf and Turf''Golden Eggs'Special editionsAngry Birds SeasonsMain article: Angry Birds SeasonsThis game contains several holiday-themed episodes:'Trick or Treat': Halloween-themed levels'Season's Greedings': Christmas-themed levels'Hogs and Kisses': Valentine's Day-themed levels'Go Green, Get Lucky': St. Rovio Mobile has supported Angry Birds with numerous free updates that add additional game content, and the company has also released stand-alone holiday and promotional versions of the game. As players advance through the game, new types of birds become available, some with special abilities that can be activated by the player. In the game, players use a slingshot to launch birds at pigs stationed on or within various structures, with the intent of destroying all the pigs on the playing field. With a combined 1.7 billion downloads across all platforms and including both regular and special editions, the game has been called 'one of the most mainstream games out right now', 'one of the great runaway hits of 2010', and 'the largest mobile app success the world has seen so far'.The initial version of the game was released on iOS in December 2009.

Its popularity led to versions of Angry Birds being created for personal computers and gaming consoles, a market for merchandise featuring its characters and even long-term plans for a feature film or television series. It has since expanded to video game consoles and for PCs.Angry Birds has been praised for its successful combination of addictive gameplay, comical style, and low price. Over 12 million copies of the game have been purchased from Apple's App Store, which has prompted the company to design versions for other touchscreen-based smartphones, including the Android, Symbian and Windows Phone operating systems. Inspired primarily by a sketch of stylized wingless birds, the first game was first released for Apple's iOS in December 2009. Angry Birds is a video game franchise created by Finnish computer game developer Rovio Entertainment.

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