While using their smarts to find six differences between every pair of near-matching pictures, kids will simply enjoy examining the many marvelous vehicles each image displays. There's a copter with a sky-high view of the world below; a railway station with long, streamlined trains on the tracks; a bicyclist speeding along on his wheels; an elevated subway passing by big skyscrapers; and ships at sea. It s a challenge and a visual delight."