Fives and Threes is a networked dominoes game for up to four players, although it works equally well when played alone. The object being to score points by playing your dominoes so that the open ends of the line add up to multiples of 5 and/or 3. Fives and Threes is a networked dominoes game for up to four players, although it works equally well when played alone. The object being to score points by playing your dominoes so that the open ends of the line add up to multiples of five and/or three.