Missing Link

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This puzzle consists of a square tower of four layers. On the sides are sliding tiles, and each side depicts a chain in different colour. One chain, the white one, is made of only three tiles, so that there is a gap. The tiles can slide up and down into the gap. The top and the bottom layer can rotate so that the pieces from different chains are mixed up. This puzzle is closely related to the Puzzle Tower/Whip-It and the Ivory Tower/Babylon Tower. The patent for the Missing Link is US 4,373,729, filed 12 Jan 1981, granted 15 Feb 1983, held by Marvin Glass & Associates. The inventors are Steven P. Hanson and Jeffrey D. Breslow. If your browser supports JavaScript, then you can play Missing Link by clicking the link below: