✓ Great gift for family, friends, or work colleagues Playing logic puzzle is not just a fun way to pass the time, due to its logical elements it has been found as a proven method of exercising and stimulating portions of your brain, training it even if you will and just like training any other muscle regularly you can expect to see an improvement in cognitive functions. Some studies go as far as indicating regular puzzles can even help reduce the risk of Alzheimer's and other health problems in later life. This Logic Puzzles book is packed with the following features: ① 200 Hard to Extreme Suguru (15x15) puzzles. ② Answers to every puzzle are provided. ③ Each puzzle is guaranteed to have only one solution. ④ Two puzzles per page (6 x 9 inches). ★★★ Includes free bonus puzzles you can download books ★★★ ♥♥♥ Suguru Adult Puzzle Book offers hours of entertainment for adults of all ages, from young adults to seniors ♥♥♥