Normal sudoku rules apply. Yin Yang: Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 area is fully shaded or fully unshaded. The shaded cells act as a German Whispers line ie if two orthogonally connected cells are both shaded, then the digits in those cells must have a difference of at least 5. A digit in a cell with an arrow counts the total number of shaded cells seen in the direction of the arrow (not counting the cell itself).