listed above is unclear. The puzzle was introduced in Japan by Maki Kaji (鍜治 真起, Kaji Maki), president of the Nikoli puzzle company, in the paper Monthly...

Maki Kaji (鍜治 真起, Kaji Maki, 8 October 1951 – 10 August 2021) was a Japanese businessman who was the president of Nikoli, a puzzle manufacturer. He is...

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