Typically thought of as a game for advanced to expert players, Spider Solitaire (4 Suits) uses two decks of cards (104 cards) made up of 2 sets of Hearts, 2 sets of Diamonds, 2 sets of Spades, and 2 sets of Clubs.
If Spider Solitaire 1 Suit or 2 Suits has become a bit too easy, give Spider Solitaire 4 Suits a try.