Collections Spot the Differences: 100 Photo Puzzle Challenges : Just as a detective must look at all the fine details in order to crack a case, you'll need to examine these puzzles closely if you want to solve them. That's because there are subtle differences between each pair of seemingly identical photos. Just to make things even trickier, the 100 puzzles feature all kinds of collections, including vintage cars, butterflies, kites, tattoos, seashells, and flags. THere are three levels - keen, sharp, and masterful - so you'll have the chance to hone your skills while having a blast. Enjoy the amazing variety of the collections while trying to solve these deceptive conundrums!