Bad Piggies is a puzzle video game developed by Finnish video game developer Rovio Entertainment, a spin-off to Angry Birds. The game launched on iOS, Android, Windows and Mac on 27 September 2012. Windows Phone and Windows 8 versions are scheduled to follow later. Unlike previous games in the series, in this entry the player controls the pigs, building devices that travel on land and air to find pieces of a map to find and take away the Angry Birds' eggs. As of 7 October 2012, Bad Piggies is the fastest-selling game on the app store, and the quickest one to reach the top of the list, in just after three hours.