Packed with more than 100 brain-boosting picture puzzles, this Smithsonian Spot the Difference book for adults is designed to keep your mind sharp and thoroughly entertained. Keep your brain fit by searching for the hidden differences between each set of pictures, specifically curated from the Smithsonian's archives. Help improve memory and focus by completing a new challenge in this "Find the Difference" puzzle book every day!Keep your brain fit and your memory sharp with a variety of fun and engaging puzzles from Brain Busters. From Crosswords to Word Searches to Spot the Difference and other stimulating challenges, our curated collection offers hours of mind-sharpening fun in these brain-training games to enhance memory and cognitive function.MORE THAN 100 PUZZLES & SOLUTIONS: Hours of fun and entertainment to enjoy with a large variety of everyone's favorite "find the difference" puzzles.TEST YOURSELF: each spot the difference puzzle is designed to keep your vision sharp and help improve memory and focus by searching for a different object from one picture to the next.LAY FLAT: Spiral-bound lays flat for ease of use at home or on the go. Whether you're drinking your morning coffee, riding on the train, or relaxing on vacation this puzzle book can go with youMAKES A GREAT GIFT: A perfect gift for Mother's & Father's Day, Christmas, birthdays, vacations, and more, puzzle books make an excellent gift for any occasion.BRAIN BUSTERS: Part of the Brain Busters Puzzle Collection from Parragon & Cottage Door Press. Look for other books including Spot the Difference Picture Puzzles, Smithsonian Natural History Word Search & Smithsonian Women in History Word Search, The Ultimate Book of Mixed Puzzles, and More!