As featured on
In the "Angry Birds" video games, you use a slingshot to lob flightless buzzards at wobbly fortresses stacked with snickering green pigs. Some quick mental physics is involved, depending on how carefully you care to estimate the trajectory of each bird and the height of each structure. But the satisfactions of these puzzles are as basic and primal as an explosion in a Michael Bay movie. They have a wondrous conceptual simplicity.