📖 关于游戏 Sudoku
the objective is to fill a 9x9 grid with digits so that each column each row and each of the nine 3x3 sub grids that compose the grid contains all of the digits from 1 to 9.
the objective is to fill a 9x9 grid with digits so that each column each row and each of the nine 3x3 sub grids that compose the grid contains all of the digits from 1 to 9.