Solitaire Duel is an intellectual solitaire where you need to make pairs of certain cards. But the order is important here, so try to be careful. Click on the pairs of open cards which add up to 13. It seems simple only at first glance. If a player knows the rules, he will figure out how to play very quickly. After the playing field is cleared or there are no pairs left, your opponent will have less time. The player with the most amount of points wins.