Abstract: A puzzle in the form of a flat, circular plate is composed of a plurality of concentric rings, wherein each ring contains numerals, symbols or parts of pictures on its front and on its rear surface. These have to be arranged in a given order on the plate by rotation and/or reversal of each ring. In the case of pictures the parts on each ring have to be assembled to form one or more complete pictures, and in the case of numerals into a given arrangement or sequence of figures. Each ring is provided with a circumferential groove and with protruding knobs engaging with the groove of the adjoining ring whereby the rings are maintained in a common plane of the circular plate.