The primary difference between Pyramid Solitaire and Spider Solitaire is that Spider Solitaire involves creating stacks of cards within the same suit in ascending order, while Pyramid Solitaire involves making pairs with a total value of 13. Spider Solitaire also uses two decks of cards, while Pyramid uses only one.
A game of Spider Solitaire begins by shuffling two decks of cards together, then dealing out 10 cards face-down. Place four additional cards face-down on each of the piles, then place one card face-up on the five cards on the right. Place one additional face-down card on the remaining piles before placing a final face-up card, ensuring that all stacks have one face-up card each. Move the cards around, making columns of alternating color cards in descending order, to free up the aces and order the cards.
In Pyramid Solitaire, begin by placing one face-up card at the top of the play area to form the top of the pyramid. Place a series of five additional rows down beneath that card and increase the total number of cards per row by one. Proceed to match any open cards, including those in the draw pile, to form a total face value of 13 and remove them from play until there are no cards left.