Brain Games : Picture Puzzles, 2 Books in 1 by Holli Fort (2008-05-04)

Scientific research has shown that exercising your brain can keep your mind young and fit. Challenging your mind strengthens it just like a physical workout strengthens your body. Your brain will get twice the workout in this two-books-in-one Brain Games Picture Puzzles set. Solving picture puzzles is an amusing and interesting way to challenge yourself. As you move through the book, you'll be asked to spot the differences in a pair or group of pictures.