1 deck. Difficult. No redeal.
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Fortress Solitaire uses 52 cards. You have 10 tableau piles (2 piles with 6 cards in each pile, 8 piles of 5 cards each) and 4 foundations.
Aces are moved to the foundations as they become available.
The object of the game
To build the foundations up in suit to kings.
The top cards of tableau piles are available to play. You may build tableau piles up or down in suit. Only one card at a time can be moved. When any tableaus are empty you can fill the space with any card.
There is no redeal.