Brain Games Picture Puzzles: Remember When? takes you on a trip back to the twentieth century as you put your powers of observation to the test. Two nostalgic pictures that seemingly are identical are presented together, but subtle changes have been made to one of the pictures. It's up to you to spot what has been altered. The book is divided into four sections of picture puzzles, each progressively more difficult.The picture puzzles feature photos that inspire nostalgia for the fads, fashions, and familiar faces of decades past.The book's vintage photos include: Route 66 road stop, 1970s protest parade, a soda shop, 1940s family room, Sesame Street, a roller skating rink, and more!Can't find all the changes? No problem -- solutions to all the puzzles are provided in the final section of the book.Spiral bound, 192 pages. The Brain Games Picture Puzzles series was developed to challenge the powers of observation and stimulate the ability to focus and concentrate.