Normal sudoku rules apply. Along each separate grey line (lengths: 3, 5 or 7) the product of the digits is 80. Each cage contains a 2-digit prime number (read left-to-right). A+B = C+D = A+C = B+D = 80
Normal sudoku rules apply. Along each separate grey line (lengths: 3, 5 or 7) the product of the digits is 80. Each cage contains a 2-digit prime number (read left-to-right). A+B = C+D = A+C = B+D = 80