Pyramid (solitaire) vs Pyramid Solitaire

"Pyramid" is a card game where players make pairs of cards, creating a sum of 13 or 14. In "Close Mode", cards are places faced down, while in "Open mode", cards are places faced up. The first row has 1 card, second row has 2 cards and so on, till the seventh row with 7 cards. Note: Even in "Close mode", the seventh row is places faced up. Leftover cards are stacked on the table as what we call the "Deck". You can also use a combination of the deck and cards of the table. In "Close mode" all cards except those in the seventh row are placed faced down. As cards in the bottom row are removed, the higher up cards are turned face up. In "13-mode", cards with a sum of 13 are stacked and removed from the table. The 13 card (King, K) is removed from the table just by touching it. Iin "14-mode", cards summed up to 14 are stacked and removed from the table. When all cards are removed from the table, the game is finished.

Thirteen is the only number that matters here. Twenty-eight cards are stacked into seven rows, one card at the apex widening to seven along the base. An Ace counts one, a Jack eleven, a Queen twelve. Find two uncovered cards that add to thirteen and both leave the table. A King, worth thirteen on its own, simply walks away unaccompanied. A card becomes uncovered only when the two cards overlapping it below have gone, so the shape dissolves upward from the base. Twenty-four cards remain in the stock for the moments when nothing on the table pairs, turned one at a time and sent round again whenever the pile runs dry. The difficulty is not the addition. It is choosing between two legal pairs when only one of them opens the row above. Beginners clear whatever they see; the deals that come out are the ones where you looked at the row overhead first and asked which removal was actually useful. Plays without a connection, remembers your times and best runs, undoes your last hundred moves, and reads in 33 languages.