Challenge your mind with this hard 9x9 Sudoku puzzle book, made for Sudoku fans who enjoy a tougher puzzle experience. This book includes 60 hard 9x9 Sudoku puzzles, with 2 puzzles per page and 60 solutions included at the back for checking your answers. Perfect for experienced solvers, puzzle lovers, brain training, quiet evenings, holidays, travel, waiting rooms and anyone who enjoys a classic logic challenge. Book details: 5 x 8 inch paperback 60 pages 60 hard 9x9 Sudoku puzzles2 puzzles per page 60 solutions included 2 solutions per page. Classic 9x9 Sudoku grid. Black and white interior. Great for experienced Sudoku players. A clean and challenging Sudoku puzzle book for anyone who enjoys focused, relaxing brain training.