For example, take a look at the following solution of such a puzzle.
Beside each row are listed the lengths of the runs of black cells in that row.
Above each column are listed the lengths of the runs of black cells in that column.
The grid starts out blank, and your aim is to find all black cells.
Left-click on a cell to make it black. Right-click to mark with X.
Let us try this example together. The initial grid is empty.
Some of the rows have the number 0 to the left of them. That means that none of the cells in that row are black. So we can immediately mark them all with X.
Let's turn to the columns. Three of them have 0 black cells, so we'll mark them with X. Also, the first column has the number 5, and only five empty cells. That means they all must be black.
The last column has the number 4, but there are five blank cells. Since the four black cells must be contiguous, you can convince yourself that the middle three must be black.
The third row has the numbers 1 1 1 1, and its leftmost cell is already filled in. Therefore, we can safely mark the cell next to it with X.
The seventh row has the numbers 3 1 1. That means that the leftmost filled-in cell is the first in a run of three black cells. We can fill in the two cells next to it.
You can try it yourself and finish solving it below.
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