Dominoes Prime

To start the game each player chooses 7 and the others are placed on the side. The highest double is placed down first. Each player then takes turns to place down a matching number to either end of the line. If a player cannot place down one of their dominoes, then they must pick from those on the side. If there is none left on the side, then the player skips their turn. The first player to place down all of their dominos is the winner. If neither player can place one down and there are none left on the side, then the game ends in a block and the winner is the last player to have placed a domino down.