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Freecell is a popular solitaire card game where all the cards are initially dealt out into 8 columns. The player can move cards between the columns building the columns down alternating colors. At any point you can put a card in any of the 4 freecells (on the top left) that does not currently have a card it. To win the game you need to build up the 4 foundations (top right) from Ace to King by suit.