Play Strictly Sudoku - A free Sudoku puzzle onlineStrictly Sudoku - A Free Sudoku Online How to play The sudoku grid consists of eighty-one squares in a nine by nine grid. To solve the sudoku, each square in the grid must contain a number between one and nine, with the following conditions: Each row of nine cells must contain each of the numbers from 1 to 9 once and only once. Each column of nine cells must contain each of the numbers from 1 to 9
