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.The book is divided into four sections of pictures puzzles, each progressively more difficult.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.Stimulate your mind a few minutes...