In Dualities two players (Even and Odd) compete to get the highest score by claiming certain lines on a hexagonal board with five hexes per side.
The game commences with the empty board and players alternate turns placing one domino-style tile (formed by two hexagons of two different colours, black and white) on a free space of 2 adjacent hexes of the board. The game ends when there’s no free space to put a tile.
To get the score players add up the lines they have claimed; Even claims a certain line if the number of black hexagons along this line is even. Similarly, Odd claims a line if the number of black hexagons along this line is odd. White hexagons are neutral. There are two different ways of scoring taking into account: a) only the 9 lines parallel to a certain direction (basic play) or b) all the lines (27) parallel to the 3 different directions in the board (expert play).
—description from the designer