Normal sudoku rules apply. Orthogonally adjacent cells are not allowed to contain consecutive digits. The only digits that can be placed on a yellow divisor line have to be divisors of the maximum digit on the line. For example, if the maximum digit on a yellow divisor line is 8, one is only allowed to place the digits 1,2,4 and 8 on this line. Digits on a yellow divisor line may repeat if allowed by other rules.