Make 13 your lucky number by mastering these tricky card pyramids! Pyramid Solitaire Duel by Qplaygames. Play with friends in this multiplayer game! Click two exposed cards that add up to 13 to remove them. You may also use cards from the stack below the pyramid, which contains 24 cards and may be flipped through only once. Score points by removing cards. Once you’ve run out of possible pairs (or have cleared the board), your opponent’s time remaining will be reduced to 30 seconds. When time is up, the player with the higher score wins. You’ll receive 13 points for each pair you remove.