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 to project an advertisement for its new N8 handset that included the game's characters. A June 2011 T-Mobile advertisement filmed in Barcelona, Spain included a real-life mock-up of the game in a city plaza, while Nokia used the game in Kuala Lumpur, Malaysia to promote an attempt to set a world record for the largest number of people playing a single mobile game. Finnair has also used Angry Birds in their advertising, including taping an Airbus A340 airliner with the Angry Birds figures and holding an Angry Birds tournament on board a flight to Singapore. Rovio has also prepared a