Angree bURDz

Angree bURDz was an April Fools joke created by Rovio on April 1, 2013. An app was created for iOS and Android the night before and was free. If opened on March 31, the app would instantly close. Once opened on April 1, there is one level with three stars automatically achieved. When clicked, a message appears, saying: "You got fooled. Happy April Fools Day 2013. From, the Rovio dev team".