Normal sudoku rules apply. Divide the grid into two galaxies. Every cell in the grid belongs to one of the two galaxies. Each galaxy must consist of a region of orthogonally connected cells, and must have 180 degree rotational symmetry. (The central point around which a galaxy is symmetrical doesn't need to actually belong to that galaxy.) No 2x2 area may belong entirely to one galaxy. One of the two galaxies behaves like a German whisper; orthogonally adjacent cells in this galaxy must have a difference of at least 5. An arrow cell counts how many cells in its own galaxy are being pointed at altogether by its arrow(s), and this combined total is displayed on the arrow cell (the arrow cell itself is not included in the count.) Vision is not obscured by the other galaxy's cells.