Author: Vladimir Portugalov
Blacken some cells in the grid so that no two black cells have a common edge and all white cells are connected. Cells with a clue cannot be blackened. Clues indicate the total count of white cells connected vertically and horizontally to the numbered cell including the cell itself.
Grid control: Click the mouse button at the selected cell to change the color of the cell. More details about grid control are at the help page.