Fortress Solitaire is a solitaire game where all 52 cards are dealt face up into 10 rows. Only the top card from each rowmay be moved. Cards can be moved into the columns where the top card is one greater than or one less than the card being moved. Any card can initially be moved into an empty foundation if all foundations are empty. However, once the first card is moved into a foundation, the other empty foundations may only receive a card of the same value.