In this puzzle, each square is either black or white.
The numbers on the left and top determine the length of the successive black squares. Those numbers also specify the order in which the blocks of black squares appear in a line (horizontally and vertically).
There is always at least one white square between each black block.
For example, the number 2 1 6 means that there are three blocks of two, one, and six black squares in the corresponding line.
Have fun and enjoy the game!