Kaji created the puzzle to be easy for children and others who didn’t want to think too hard. Sudoku championships have drawn some 200 million people in 100 countries over the years, according to Tokyo-based Nikoli. Originally, Sudoku was called “Suji-wa-Dokushin-ni-Kagiru," which translates to, “Numbers should be single, a bachelor." In recent years, Sudoku, believed to be the world’s most popular pencil puzzle, has come out in digital versions. To complicate matters further, the grid is also sub-divided into nine blocks containing nine single squares, and each block must also contain the numbers one to nine.

Source: Mint August 17, 2021 06:56 UTC