About

This puzzle consists of two overlapping circular disks. The distance between the centres is exactly one radius length. The disks are made up of many pieces with curved sides, which allow them to be rotated any number of quarter turns. Each disk has 4 squares, 4 diamonds, and 12 triangles. As some pieces are shared between the two disks, there are all together 6 squares, 7 diamonds, and 20 triangles. The puzzle comes in three possible colour schemes: The central 4 triangles of one disk are red, those of the other disk are blue, and all the rest is yellow. One disk is completely yellow, and the remaining parts of the second disk are red. One disk is red and the other is blue, except that the pieces which are shared between them which are yellow. These are in order of difficulty - 1 is easiest and 3 is hardest. Rashkey was invented by Oleg Raschkov, and patented on 2 September 1999, DE 29,904,348 U. If your browser supports it, you can click on the link below to see a Javascript version of the Rashkey puzzle. It can play all three types. The solver for types 1 and 2 will always find the shortest method, but the solver for type 3 will do the triangles, squares, and diamonds in separate phases (though each of those phases is done in shortest way, the overall solution will usually not be optimal).