Abstract: A duck on a rock game is provided and consists of a plurality of playing pieces and a base member whereby one of the playing pieces is positioned on the base member and during play of the game another of the playing pieces can be placed upon the first playing piece. Each playing piece has a flat top surface of given area. A disc, with a flat top of lesser area, is screw threaded to each playing for adjustment between a raised and flush position relative to the flat top of the playing piece to change the area for supporting a superimposed playing piece.