A 69-year-old Chinese farmer provided a second answer to the most difficult Sudoku in the world

The most difficult Sudoku in the world, it has only “one answer”

Finnish mathematician Yinka La spent three months in the design of a Sudoku (squared game), which claimed to be by far the most difficult in the world, and it has only one answer. But earlier this year a 69-year-old Chinese farmer, Huang Jinlong, provided a second answer in just three days. Huang Jinlong also said he wanted to make more friends with interests on Sudoku.

Source: Xinhua Net