Angry Birds (video game) was being played, the staff liked the characters, and the team elected to design a game around them. In early 2009, physics games, such as "Crush the Castle", were popular flash-based web games, so the Rovio team was inspired by these games. During the development of "Angry Birds", the staff realized the birds needed an enemy. At the time, the "swine flu" epidemic was in the news, so the staff made the birds' enemies pigs. Angry Birds was the studio's 52nd produced game and on its initial release, the game did not sell many copies. After Angry Birds was a
Angry Birds (video game) On June 23, 2015, Flock Favorites was added with 15 levels inspired by previous episodes. On December 11, 2015, in honor of Angry Birds 6th birthday, new 15 levels were added to Birdday Party. On December 11, 2016, in honor of Angry Birds' seventh birthday 15 more levels were added to Birdday Party. On May 16, 2017, a dual virtual currency system was added to the game, in which currency is earned throughout gameplay (or accrued through in-app purchases) and can be used to purchase power-ups and other in-game items. Since its initial release for the Nokia N900 multimedia Internet