Normal sudoku rules apply. Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected and no 2x2 square is completely shaded or unshaded. Every dot must touch a shaded cell. Adjacent digits within the shaded region must differ by at least 5. If two digits are joined by a black dot one must be double the other. Digits joined by a white dot are consecutive.