Angry Birds (video game) use polish – such as sharper visuals, a better price and smoother action." Damien McFerrin of British website Electric Pig reviewed the PC version, saying "the mouse-driven control method showcases many distinct advantages over its finger-focused counterpart". Angry Birds has also been described critically as impossible to understand the playing rules criteria by game critic Chris Schiller of Eurogamer.net, which has 'a contemptuous attitude towards its players, keeping them just frustrated enough not to switch off and play something else instead.' "Angry Birds" became the top-selling paid application on Apple's UK App Store in February 2010, and reached the top
Angry Birds "Bad Piggies: Egg Recipes", along with doodle books based on some characters of the game. After a few weeks of the release of Angry Birds Space, they also released Angry Birds Space books about numbers, alphabets, and stickers. On 20 March 2012, "National Geographic" published a paperback book titled "Angry Birds Space: A Furious Flight Into The Final Frontier" shortly before the release of "Angry Birds Space" which became available on 22 March 2012. National Geographic also has a book titled "Angry Birds Feathered Fun" for learning all about birds. In the same year, Rovio created a contest with the