Place your pieces to make a line of four in a row, either vertically, horizontally, or diagonally.
Choose which player will play black and go first.
Starting with the black player, take turns adding your piece in one of the empty spaces, but the piece will fall to the lowest empty space in the column. If you make a line of four in a row, you win immediately. If the board is full without any line of four in a row, the game is a draw.