Spot the differences! -- Two or more pictures that seemingly are identical are presented on the same page, but subtle changes have been made to one of the pictures. It's up to you to find what has been altered. Divided into 4 levels, each progressively more difficult. Full-color photos. 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. This is the fourth book in the Brain Games Picture Puzzles series. The series was developed to challenge your powers of observation and stimulate your ability to focus and concentrate. All books in the series contain unique content.