By:  fred
Which collection?                 Which Level?  

Num Squares to Color: 

Color each square white or black.
Click to blacken a square, click again to white it, again to re-gray it.
(or shift-click to white);

The numbers indicate how many white squares can be 'seen' horizontally and vertically from the cell.
Cells see themselves. They do not see thru black square.

	All white cells must be connected as a single polyomino:
		a continuous path attached at edges
	Each black cell MUST be isolated from other black cells (not attached at edges).

Kuromasu is an original puzzle of Nikoli;
it first appeared in Puzzle Communication Nikoli #34 (June 1991).