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) a version for devices using Google's Android operating system, with a beta version being released through the Android Market (now Google Play) in September 2010. The full Android version of the game was first released instead on GetJar in October 2010, though it was subsequently released on Android Market within days. Rovio officials noted that GetJar had a more global reach than Android Market, and GetJar's availability on other smartphone platforms (including Symbian) would make cross-platform promotion of the game easier. Unlike the previous versions, "Angry Birds" for Android is a free, ad-supported application, as paid applications aren't available on