Spider Solitaire is undoubtedly one of the most played solitaire card games in the world. The game got its name because a spider has 8 legs and you have to build eight complete sequences to win the game. This fun and the addictive classic game is often called "the King of all solitaires". It has inspired the invention of a number of new variations of this game, including easy (one suit) and medium (two suits) versions.
The traditional version is played with two decks of cards, using all four suits. The object of the game is to build 8 sequences down in suit within the tableau (each running from King to Ace) and then move them to 8 foundations.
Not every game of Spider Solitaire is winnable, but you can improve your chances of winning by carefully planning your moves. Obviously, there is luck involved, but it is most definitely a game of skill.