(Totally) Normal sudoku rules apply. Digits along an arrow must sum to the digit in that arrow's circle. A cell containing an opaque grey square must contain an even digit. A cell containing an opaque grey circle must contain an odd digit.
(Totally) Normal sudoku rules apply. Digits along an arrow must sum to the digit in that arrow's circle. A cell containing an opaque grey square must contain an even digit. A cell containing an opaque grey circle must contain an odd digit.