Normal sudoku rules apply. The value of a digit on a line between two circles must be between the two values of the digits in those circles, eg if the two circles joined by a line contain 3 and 6, the digits on the line could be 4 or 5.
Normal sudoku rules apply. The value of a digit on a line between two circles must be between the two values of the digits in those circles, eg if the two circles joined by a line contain 3 and 6, the digits on the line could be 4 or 5.