Pyramid Solitaire is a popular solitaire card game known for its unique pyramid-shaped tableau. It is played with a standard deck of 52 playing cards. The goal of the game is to remove pairs of cards that add up to 13, such as a King (13) and an Ace (1), a Queen (12), a Jack (11) and a 10 is 10, and so on. The pyramid is set up with a base of 7 rows of cards, each containing a different number of cards. Valid moves include: Removing two cards that add up to 13. Kings can be removed individually. Aces count as 1, and Queens count as 12. Cards that are not covered by any other cards are available for play. The game is won by removing all cards from the pyramid or successfully pairing all available cards to add up to 13.