Following up on its mega-hit Angry Birds, Rovio has turned the tables and made a new game with porcine protagonists. A blend of a physics game and a building puzzle, players are given an array of materials to build something — a plane, a cart, a hovercraft — to navigate through treacherous terrain. The stages are brain tickling but not difficult enough to frustrate. You can also earn extra points by meeting smaller goals, such as meeting a time limit, to make each level a little more challenging. Free, for iOS and Android.