Normal sudoku rules apply. Digits along an arrow must sum to the digit in that arrow's circle. Cells separated by a white dot must contain consecutive digits. Not all possible dots are given. Digits in cages sum to the small clue in the top left corner of the cage. Cells that share the same position in 3x3 boxes may not contain the same digit (eg if there is a 1 in the top left cell of Box 1 there may not be a 1 in the top left cell of any other box.)