Normal sudoku rules apply. Shade some cells so that every orthogonally connected group of shaded cells is rectangular, and every orthogonally connected group of unshaded cells is non-rectangular. (For the avoidance of doubt, a square is a rectangle.) A digit in a circle represents the number of cells in its shaded or unshaded group. Clues above a column represent the sum of any SHADED cells between the 1 and 9 in that column. Clues to the left of a row represent the sum of any UNSHADED cells between the 1 and 9 in that row.