It's picross! Uncover the hidden shape by checking off the squares. The number of squares that must be checked off in each row/column are found on the top and left of the board. To check off a square, input its coordinates found on the bottom and right of the board (horizontal coordinate first, then vertical).
Do you have a big brain, a pen and paper, and an hour to kill? Try this self-referential logic test! People who succeed gain automatic admission to MENSA.