Fortress Solitaire

Klondike Solitaire is the most famous variety of solitaire. It was popularized by Microsoft who released their version of Klondike "Microsoft Solitaire" with their Windows Operating System.

Freecell Solitaire is another popular solitaire card game where the player uses empty cells to move cards in and out of while trying to build up the four foundations from Ace to King.

Colorado Solitaire is a two deck solitaire card game played with 20 piles and 8 foundations. 4 foundations are built up and the other 4 are built down. Any cards may be placed on the piles.

In Pyramid Solitaire, the player is attempting to match two cards together that have a rank that totals 13. The cards are dealt into a pyramid shape.