Pro Colorado Solitaire - Version 1.0 Pro Colorado Solitaire is a free 2 deck solitaire card game for the PC. Pro Colorado Solitaire is played with 20 piles which may have cards from the stock pile placed on them without regard to rank or suit. Pro Colorado Solitaire has 8 foundations, four of which are built up, and the other four are built down by suit. Pro Colorado Solitaire has been modified to make it more difficult than traditional Colorado Solitaire by moving 4 Kings and 4 Aces to the bottom of the deck.