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Colorado Solitaire is a two deck pile based solitaire card game where the player has 8 foundations and must build 4 of them up from Ace to King by suit, and the other 4 down from King to Ace by suit. In Colorado Solitaire, the cards can not be moved between the piles, and only the top card in each pile can be moved from the pile to one of the foundations. The player also does not have to build down the piles, and can move the top card in the stock pile to any pile he chooses. The catch is, placing the cards in order is not always possible, and the player has to choose carefully where to move the card from the stock pile.