Each puzzle contains a hidden quote, with the spaces for each letter in that quote laid out in a typical crossword puzzle-type black and white grid.
Solve the quote by placing letters in the squares from those available in the column above the square.
To fill in a square, select it first then enter the letter by either clicking on a letter in the column above or entering the letter via the keyboard. You can move the highlighted square by using the arrow keys.
To clear a square, use the eraser icon or press the space or delete key.
Note that words may wrap around to the next line. Words end at black squares.