Pyramid Solitaire is played on a pyramid of 28 cards, and the rule is arithmetic rather than sequence: remove pairs of exposed cards that add up to 13. Aces are 1, jacks 11, queens 12, and kings are 13 — which means a king comes off on its own.
The trick is that only uncovered cards are available, so a card you need may be buried under two you can't remove yet. Working out which pair to take first is the real puzzle.
Face value for numbered cards, ace 1, jack 11, queen 12, king 13. Since pairs must total 13, kings are removed on their own.
Because matching cards can end up buried beneath each other. Choosing pairs that expose the most new cards is the main defence against it.
Yes — tap two cards to remove them. Nothing to install.