The object is to reveal a hidden picture by painting the squares around each clue so that the number of painted squares, including the square with the clue, matches the value of the clue.

There is only one unique solution for each puzzle.

First click fills a square, second click displays an X to indicate the square is blank and third click brings the square back to its original state. Multiple squares may be filled or blanked by dragging the mouse. To finish the game, all squares must be either filled or blanked according to the rules. When the last square of the puzzle is filled or blanked correctly, a congratulations message together with a thumbnail of the puzzle will pop up.