Colorado Solitaire
Colorado Solitaire takes an interesting turn from the usual card games by having two sets of foundation piles with slightly different rules for each.
There are 8 foundation piles. Whenever you move a card from one of the tableau piles to a foundation, if the space is now empty, it immediately filled with a card from the stock.
When you have a card from the stock that you are unable to play, you must move it onto one of the tableau piles before you can continue.
Only the top most card of any tableau pile is playable, so consider how blocking the below card may affect future moves.
You win the game by getting every card to the foundation piles.