Old Puzzle. The following text is printed on the back of the box. With the 9 pieces a large square or other figuresis to be formed in such a way that the same colour shal not occur more then once in any row horizontal or vertical (in the square also diagonal) This must be done for each symbol. .Material . Cardboard pieces
All numbers are in a slide.Slides from left to right. Under number 4 is the free hole. A difficult puzzle, but it can be solved. Assignments on the back of the puzzle.Material acrylic.
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