Shade some rectangular areas in the grid. Each rectangle should have sides at least 2 cell long. Different rectangles cannot touch each other even at a point. Numbers outside show the number of cells occupied by the rectangles in the corresponding row or column.
Grid control: Click the mouse button at the selected cell to change the color of the cell. You can use mouse dragging to copy content from one cell to another. More details about grid control are at the help page.