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On the Rubik's Cube page in Chinese Wikipedia, there is such a sentence:
魔術方塊與中國的華容道、法國的單身貴族（獨立鑽石棋）同被稱謂智力遊戲界的三大不可思議。
It says that Rubik's Cube, Klotski from China, and Peg solitaire from France are called "The Three Inconceivable Puzzles." However, I cannot find any English record about this. There's no such record in English Wikipedia. Although this record also appears on the page of "Puzzle" and the page of "Peg solitaire" in Chinese Wikipedia, it doesn't exist on these pages in English Wikipedia. I googled "three inconceivable puzzles", "three incredible puzzles", and other similar keywords, and I got nothing related to this record. I also googled "Rubik's Cube Klotski Peg solitaire", but still I didn't get this record. Therefore, this is probably just a rumor spreading over China.
I googled the Chinese keyword "智力遊戲界的三大不可思議" and got a lot of results, one of which was "(華容道)與魔方、獨立鑽石棋一起被國外智力專家並稱為'智力遊戲界的三個不可思議'." If translated into English, it says that Klotski, Rubic's Cube, and Peg solitaire are called by foreign intelligence experts "The Three Inconceivable Puzzles." If this concept is raised by foreign experts, how come there is no English record about it? ("foreign" here means outside of China)
Prof. McWilliams is right. Never trust Wikipedia.
