The game is a version of Canfield Solitaire with two decks of cards, but with a different amount of reserve and tableau cards. Canfield is often called Demon in reference to the difficulty of the game.
Your goal is to move 103 cards to the 8 foundation piles in ascending order by suit. 1 card is already placed in the foundation for you.
Foundation piles: These are 8 piles where you aim to move all cards in ascending order. Each foundation pile will begin with a starting number, which is determined by a single card placed in the foundation at the beginning of the game. For example, if the starting card is a 7 of Hearts, it would be followed by an 8 of Hearts and so on until the final card is the 6 of Hearts. All other foundation piles would start with an 8 as well. Successfully placing all 104 cards in the foundation wins the game.
Tableau piles: These are the 8 face-up cards in the middle of the game.
Reserve pile: These are the 40 cards laid out in a column on the left, with the last card facing up. Whenever a tableau column opens up, the bottom reserve card is placed there.
Stock pile: The rest of the cards, or 54 cards, go into the stock pile. You can go through the stock pile unlimited times.
Waste pile: Cards are moved 3 at a time from the stock pile to the waste pile. The top card of the waste pile can be moved either to the foundation or the tableau if it is a legal move.
When looking at 248 random games played, 71 were won, making the win rate 28.634%. This makes Demon Solitaire easier the Double Canfield, which has a win rate of 8.94%. This is because there are twice as many tableau columns in Demon Solitaire, giving you more opportunities to move cards.
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