Brood is a polyhex-matching game for two players – Black and White – played on an initially empty hex board. Definitions: 1 A group is a stone along with all stones one can reach from it through a series of steps onto adjacent stones of the same color. 1.1 The size of a group is the number of stones in it. 2 A brood is a group along with all other groups of identical color, size and shape. Shapes are considered identical across reflection and rotational symmetries. 2.1 The size of a brood is the number of groups in it. 2.2 The order of a brood is the size of the groups in it. 2.3 The mass of a brood is the number of stones in it (its size times its order). Play: On the very first turn of the game, Black places one stone of their color on any hex. After, that – starting with White – take turns doing one of the following: Pass or Place two stones of your color on empty hexes. When the players pass consecutively, the winner is the player with the higher score. Ties are not possible. Scoring: For each of your broods, you score its mass multiplied by the lesser of its size and its order. For example, if a brood consists of 2 groups of size 3, it is worth 12 points. Its order is 3, its size is 2 and its mass is 6. Since 2 is smaller than 3, the brood is worth 6*2 = 12. —description from the designer