Everything about Missing Link Puzzle totally explained
Missing Link is a
mechanical puzzle invented in 1981 by Steven P. Hanson and Jeffrey D. Breslow.
The puzzle has four sides, each depicting a chain of a different color. Each side contains four tiles, except one which contains three tiles and a gap. The top and bottom rows can be rotated, and tiles can slide up or down into the gap. The objective is to scramble the tiles and then restore them to their original configuration.
There are 15 tiles and a gap, giving a maximum of 16! arrangements. However, the middle tiles of each four-tile chain are identical, and each position is equivalent to three other positions obtained by rotating the entire puzzle, reducing the number of arrangements to 16! / 32 = 653,837,184,000. If the three long chains are also considered interchangeable, then the number of arrangements is further reduced to 16! / 192 = 108,972,864,000.
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