Where is Black Cells is played on a rectangular grid. Some of these
cells have numbers in them. Each cell may be either black or white. The object
is to determine what type each cell is.
The following rules determine which cells are which:
- Each number on the board represents the number of white cells that can be
seen from that cell, including itself. A cell can be seen from another cell if
they are in the same row or column, and there are no black cells between them in
that row or column.
- Numbered cells may not be black.
- No two black cells may be horizontally or vertically adjacent. Conversely,
all the white cells MUST be connected horizontally or vertically.