Angry Birds - a series of computer games launched in December 2009 by Rovio Mobile, in which players use a slingshot from which birds are fired towards pigs located on different structures. The condition for completing the board is the destruction of all pigs. The first game was released in December 2009 for the iOS platform (Apple). Since then, over 12 million copies of the game have been sold on the App Store. This fact influenced the manufacturer's decision to create versions for other smartphones in the touch version, such as those using Android (and others). Rovio Mobile has provided Angry Birds with many free updates with additions to the game content. Independent versions of the game (related to Christmas, eg Halloween) have also been created.