Sudoku Book 1,600 Puzzles, 400 Easy, 400 Medium, 400 Hard and 400 Extra Hard - Sudoku Book - Bog

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 great value bargain size Sudoku puzzle book contains 1,600 puzzles, with four levels of difficulty to help you improve your game. There are 4 puzzles per page and solutions are at the end of the book.