The board consists of nine squares, each of which is made up of four cells. If a square contains only your pieces, and none of your opponent's, you "own" that square. The object of the game is to become the owner of three squares on the board in a horizontal or vertical line.

There are four variants included, which are basically different starting layouts. The default one seems, to me, to produce the most interesting games.

(By the way, if you're wondering why I called it "Harlequinade," it's mainly due to the pattern I designed into the board. But I reckon it seems to fit the game generally!)

You should extract from the downloaded zip file preserving path names.