This is another 3D model of a mathematical game called Qirkat found in a portuguese locality called Penha Garcia. It is engraved in granite and has a dimension of 20x22 cm. As you can see, the marks of this game aren't easily noticeable due to constant effects of erosion.
You can find it in the following coordinates: 40º02’32.1’’N 7º01’02.1’’W