Solitaire is a classic Klondike solitaire card game. Solitaire is so interesting and so popular, people all over the world like playing solitaire to relax themselves. When people say "Solitaire", it is generally referred to as the Klondike solitaire. Klondike solitaire is most popular and most classic solitaire card game, compared to the other solitaire card games, like Spider Solitaire, FreeCell ...