The pairing rule
Jack counts eleven, Queen twelve, King thirteen. A King clears on its own; every other card needs a partner that brings the total to exactly thirteen.
Pyramid is the arithmetic Solitaire: twenty-eight cards stacked in a triangle, cleared by pairing cards that add up to thirteen. Rounds are short, which makes it a good game for a five-minute break.
Play Pyramid SolitaireJack counts eleven, Queen twelve, King thirteen. A King clears on its own; every other card needs a partner that brings the total to exactly thirteen.
Only a card with nothing overlapping it can be paired. Clearing the row below always opens two more cards above it, so order matters more than speed.
Cards you cannot pair from the pyramid come from the stock. The waste top is always pairable, which is the escape hatch when the pyramid itself is locked.