September 15, 2019

Last Updated on 2021-04-10 by Clay

Do you know a game it named "Sudoku"? It's a puzzle which is formed from numbers, I thick it's fans are everywhere. (Just like my mom.)

First, I quote the introduction of Wikipedia:

Sudoku (数独 sūdoku, digit-single) (/suːˈdoʊkuː/, /-ˈdɒk-/, /sə-/, originally called Number Place)^[1] is a logic-based,^[2][3] combinatorial^[4] number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contain all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution.

Wiki