Look first at one photo, then at the other: they're almost the same, but not quite. And that's the challenge and the fun of this game, which demands good concentration and a sharp eye. But one thing's for sure: although you may have to search carefully to find the six subtle differences between the two nearly identical images, you'll realize in a single glance what sets this collection apart. All the puzzles are carefully composed color photos, rich in detail, and wonderfully arranged in categories, such as seasons, animals, travel, holidays, and vehicles. Hone your powers of observation gazing at photos of flame-colored trees; a lioness and her cub; bridges, boats, and buses; and a sky-high view of the world below from a helicopter.