What's so sneaky about these puzzles? More than 200 puzzles show you. Try to follow four kangaroos hopping through a maze, then try to pick the only one that gets through. Look at two pictures of sunbathers at the beach that seem to be just alike, but figure out the 15 ways they are different. Study some faces, right-side up and upside down, and try to match them up. Help people of various heights, standing in front of pools of various sizes, by finding...