Normal sudoku rules apply. The digits on an arrow sum up to the digit in that arrow's circle. Orthogonally adjacent cells (ie those that share an edge) must not add up to 5 or 10.
Normal sudoku rules apply. The digits on an arrow sum up to the digit in that arrow's circle. Orthogonally adjacent cells (ie those that share an edge) must not add up to 5 or 10.