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 Stella Some reviewers have praised the game for its introduction of new characters and return to the original style of gameplay. After the release of "Angry Birds Stella", a third, unnamed episode was teased at the end of the game's second episode, but the episode was cancelled, and the game was discontinued on September 8, 2015. However, Stella's adventures continue in "Angry Birds POP!" and the second and final season of the "Angry Birds Stella" series. Angry Birds Stella Angry Birds Stella, also known as Angry Birds Slingshot Stella, was a puzzle video game and the second spin-off from the "Angry