Halloween Solitaire
Halloween Solitaire has a large collection of Halloween themed solitaire card games you can play for free online.
The game on this page is called Klondike Solitaire, and is a game of sorting cards. You move cards between columns while trying to eventually move all cards into the four foundations at the top of the game screen in order and aranged by suit.
If you prefer to play the older version of Halloween Solitaire, it is still available here.