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.Includes photos of historical, popular, and culturally relevant landmarks, venues, and locations in the United States and around the world.An informational note called Travel Trivia accompanies each picture puzzle.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 your powers of observation and stimulate your ability to focus and concentrate. Stimulate your mind a few minutes at a time!