All Threes Domino

Launch by selecting 7 domino tiles each for a two-player game. Set the first tile on the board to initiate the domino chain. Switch adding tiles to either end of the chain, checking that the same numbers meet. Score points by forming multiples of 3 at the ends of the chain. Determine your score by totaling the numbers on the ends of the domino chain after each move. Proceed playing until one player exhausts of tiles or no more moves are possible. The one with the highest score at the end claims victory.