Download or read book Sudoku Book 600 Puzzles, 300 Hard and 300 Extra Hard written by Sudoku Book and published by Createspace Independent Publishing Platform. This book was released on 2017-02-03 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sharpen up your mind and improve your memory by playing Sudoku every day. Sudoku stimulates your mind, increases concentration and makes you feel happy by giving you a sense of accomplishment. It is said it can also reduce the chance of developing Alzheimers. This Sudoku puzzle book contains 600 puzzles, with two levels of difficulty to help take your game to the next level. There are 4 puzzles per page and solutions are at the end of the book.