Normal sudoku rules apply. Digits along an arrow sum to the digit in that arrow's circle. Digits in cells separated by a white dot are consecutive. Digits in cells separated by a black dot have a 1:2 ratio (ie one digit is double the other).
Normal sudoku rules apply. Digits along an arrow sum to the digit in that arrow's circle. Digits in cells separated by a white dot are consecutive. Digits in cells separated by a black dot have a 1:2 ratio (ie one digit is double the other).