Double Klondike is a variation of the popular solitaire card game Klondike, which can be played by one person. The game is also known as Double Solitaire, but Double Klondike is the most commonly used name. Like traditional Klondike, it is believed that the game originated in the late 19th century.

The game is played using two standard decks of 52 cards, with a total of 104 cards. The cards are dealt into thirteen piles, with the first pile having one card, the second pile having two cards, and so on, with the thirteenth pile having thirteen cards. The cards in each pile are faced down, except for the top card, which is turned face up.

The objective of the game is to move all of the cards to the foundation piles, which are located at the top of the game board. The foundation piles are built up in suit from Ace to King. The player can move cards from the tableau piles to the foundation piles, or from one tableau pile to another.

To begin the game, the player turns over the top card from the deck and places it face up on the first foundation pile. The player then goes through the tableau piles and turns over any face-down cards that are now available.

Once the player has turned over all of the face-down cards, they can begin moving cards to the foundation piles. The player can only move a card to the foundation piles if it is in the same suit and one higher in value than the card on top of the foundation pile. For example, if the top card on the foundation pile is a 5 of Hearts, the player can only move a 6 of Hearts to that pile.

The player can also move cards between the tableau piles. The player can move a card to another tableau pile if it is in descending order and alternating colors. For example, if the top card on a tableau pile is a 7 of Hearts, the player can only move a 6 of Spades to that pile.

The added complexity of Double Klondike comes in the form of extra cards and piles, as well as the option to move cards to a second set of foundation piles. This second set of foundation piles is located below the first set and also built up in suit from Ace to King. The player can only move cards to the second foundation piles once the first foundation piles have been completed.

Additionally, in Double Klondike, the player has the option to move cards from the waste pile to either the first or second foundation piles. This allows for more flexibility and potential moves.

If a player is unable to move any cards to the foundation piles or between the tableau piles, they can draw one card from the deck and place it face up on the first foundation pile. If the card can be moved to the foundation piles or between the tableau piles, the player can do so. If not, the card is placed in a waste pile.

In terms of scoring, Double Klondike is usually played without scoring. However, some players may choose to keep score, with the player earning one point for each card moved to the foundation piles.

Double Klondike is a more challenging and complex version of the classic solitaire game Klondike. It requires a good amount of strategy and patience, as the player must manage two sets of foundation piles and a larger number of cards. It is a great way to pass the time and improve your card skills.