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Fortress is a solitaire card game played with a deck of 52 playing cards.

The foundations form a central column on the tableau. The cards are dealt to the left and right of the foundations, forming ten rows of five overlapping cards each, with the top two rows having six cards each.

The top card of each row (the cards that are exposed) is available for play either on the foundations or on any other row. The foundations are built up to Kings in suit and the rows are bulit up or down regardless of suit. Once a row becomes empty, it is filled by any card.

The game is won when all of the cards are built onto the foundations.

Keyboard play

Mouse play

Super Moves

These instructions are licensed under the GNU Free Documentation License. They use material adapted from the Wikipedia article "Beleaguered Castle".