All Threes Domino

Start by selecting 7 domino tiles each for a two-player game. Place the first tile on the board to start the domino chain. Switch placing tiles to either end of the chain, checking that the corresponding numbers meet. Gain points by making multiples of 3 at the ends of the chain. Figure out your score by summing the numbers on the ends of the domino chain after each move. Proceed playing until one player runs out of tiles or no more moves are possible. The player with the highest score at the end wins.