Calcudoku Adult Puzzle Book: 1000 Hard (6x6, 7x7, 9x9) Mathdoku Puzzles (The Big Books of Logic Puzzles Series)

✓ Great gift for family, friends, or work colleaguesThis Calcudoku book is packed with the following features:① 1000 Hard Calcudoku (6x6, 7x7, 9x9) Puzzles.② Each puzzle is guaranteed to have only one solution.③ Answers to every puzzle are provided.④ 6 puzzles per page (8.5 x 11 inches).Playing Calcudoku 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.Completing Calcudoku regularly helps the brain process both problem solving and improves the logical thought process with the use of deductive reasoning, which can also be applied to approaching real-life challenges in a different manner.Includes free bonus puzzles you can download. ★★★★★ Calcudoku Adult Puzzle Book offers hours of entertainment for adults of all ages, from young adults to seniors ★★★★★♥ We hope this will be an entertaining and uplifting mental workout, enjoy Calcudoku ♥ Read more