The hard sudoku puzzles in this book use the numbers 1 – 9. There is adequate space on each page for filling in the puzzles. Great travel puzzle books for adults!
- 9×9
- 400 Puzzles
- 6″ x 9″ Travel size
- Difficulty level: Hard
- Solutions in the back
Find more puzzle books and Free Puzzle Downloads at BrinkPublishing.com
- 16×16 Sudoku puzzles for adults on our website
- Mixed puzzle book for adults on our website
