Mar 25, 2011 - Warsaw based ZigZag Studio announces that their first application for children. Ben the Tractor and the lost sheep is now available in the Apple's App Store. Ben the Tractor and the lost sheep is a book full of wonderful and funny animations, about Ben the Tractor and his adventure - the sheep search. Ben the Tractor drives all over the farm searching for the lost sheep. While reading, a child discovers hidden animations of animals, the tractor and other characters.