Sudoku Puzzle Book, 1,200 Puzzles - 300 EASY, 300 MEDIUM, 300 HARD and 300 EXTRA HARD

You might not be an Einstein but you can really sharpen up your mind and improve your memory by playing Sudoku every day. Sudoku stimulates your mind by helping you practice your logical thinking process, increases concentration and makes you feel happy by giving you a sense of accomplishment. It has also been shown to reduce the chance of developing Alzheimers. With four levels of increasing difficulty this economical Sudoku Puzzle Book is designed to gradually improve your game. There are 4 puzzles per page and solutions are at the end of the book.