Players take turns placing signs on the empty cells of a 3×3 grid (one always crosses, the other always o's). The first player to arrange three of their pieces in a row, either vertically, horizontally, or diagonally, wins the game. If both players have filled all nine cells and there are no three matching signs in any row, column, or diagonal, the game ends in a draw. The player who places crosses makes the first move. Usually, at the end of the game, the winning side crosses out their three symbols (zeroes or crosses) that make up a continuous row.