Puzzle game using interfitting pieces - has concave and convex circle arcs on each piece with tongue and groove along edges enabling them to slide w.r.t. one another

摘要

The puzzle game is made up of pieces juxtaposed which have one edge shaped like a convex circle arc and another edge as a concave circle arc. The edges are shaped to form a tongue-and-groove effect. The tongue on one side of each section is able to slide in the groove which acts as a rail. Each surface has a picture on, and may have a relief design on. The pieces fit onto a base and can slide within it to vary their relative position.