Normal sudoku rules apply. Digits on a line must be between the numbers in the circles of that line. Also each line acts as an arrow, so that the number in one circle is the sum of all the other digits on the line, including the other circle.
Normal sudoku rules apply. Digits on a line must be between the numbers in the circles of that line. Also each line acts as an arrow, so that the number in one circle is the sum of all the other digits on the line, including the other circle.