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 Space Angry Birds Space Angry Birds Space is a physics-based puzzle game and the fifth game in the "Angry Birds" video game series. It is developed and published by Rovio Entertainment. Angry Birds Space was released on March 22, 2012. The game was featured in NASA videos and the game features NASA spacecraft that when found unlock unique levels. Unlike the previous "Angry Birds" games, the stage is no longer flat, instead comprising several different planets, each of which has its own gravitational field that affects the trajectory of the birds after launch. There is an aiming system that makes it