About Missing Link (puzzle)
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.
http://upload.wikimedia.org/wikipedia/en/thumb/7/75/Missing_link_puzzle.jpg/100px-Missing_link_puzzle.jpg
看起来不起眼吧，也是一项早在20多年前就申请专利的发明。 @_@ 还是看不大懂啊 我英语从来就没及格过，看不懂，那个魔方有意思，怎么转啊？ Missing Link 是一个长方体，分为4段。
初始状态是四面颜色分别为绿、蓝、黄、红。绿、蓝、黄色的Link都是3个环，占4块。红色Link只有2个环，占3块，旁边有一块是空的。
如图
有两种变化方式：
其一是可以把空格旁边的贴片移动到空格处。
其二是两端的两段可以旋转。 曾经有， 哎哟,汗啊,你要是能翻译下就好了, 失踪的链接是1981年发明的力学难题和杰弗里·汉森d .史蒂文·布雷斯洛。 这个难题有四条边,每个描述一系列不同的颜色。每一方包含4块,除了一个包含三个砖和一个缺口。顶部和底部可旋转,行可滑动向上或向下的空隙中。这个目标是为了争夺瓷砖,然后恢复他们原来的配置。 有15瓦和一个缺口,给予最多16 !安排。然而,每个four-tile链的瓷砖都是相同的,和每个职位相当于其他三个职位所获得的旋转整个谜团,减少安排!653,837,184,000 / 32)。如果三个长链也都被认为是可互换的数量,然后安排进一步减少到16岁!/ 192 = 108,972,864,000。
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