Divide the grid into regions, each consisting of nine orthogonally connected cells. Each row, column and region must contain the digits 1 to 9 once each. The digit in the top-left cell of a region (its leftmost cell in its highest row) is its “region number”. All region numbers are different. If a cell with the digit X in a region with the number N contains an arrow, then the cell X steps away in the indicated direction belongs to the region numbered N+1. Not all possible arrows are given.