1000 Sudoku Puzzles 500 Medium & 500 Hard is a perfect funny Sudoku book for adults. Would you like to improve your logical skills? Love hard Sudoku puzzles? Then you'll love this book! If you're looking for a sudoku book for beginners, here's the perfect first sudoku puzzle book for you! Why play Sudoku? ✓ Sudoku gives your brain the ultimate workout. ✓ It keeps you and your mind healthy and productive. ✓ It helps to maintain and improve your memory. ✓ It also can increase your concentration and focus. 1000 enjoyable Sudoku puzzles Medium level: 320 puzzles Hard level: 680 puzzles Keeps your mind active and performing well. Suitable for all levels: beginner to expert