When you buy this book you get an electronic version (PDF file) of the interior of this book. You can play the puzzles in this book on your mobile phone! Become

When you buy this book you get an electronic version (PDF file) of the interior of this book. You can play the puzzles in this book on your mobile phone! Become

When you buy this book you get an electronic version (PDF file) of the interior of this book. Become a master in solving Anti-King Sudoku 15x15. After solving a

When you buy this book you get an electronic version (PDF file) of the interior of this book. Become a master in solving Anti-Knight Sudoku 15x15. After solving

When you buy this book you get an electronic version (PDF file) of the interior of this book. Become a master in solving Anti-Knight Sudoku 12x12. After solving