The aim of Castles in Spain Solitaire is to build four foundations up from ace to king regardless of suit using a standard 52-card deck.
Player is dealt all 52 cards into thirteen piles, four cards in each pile.
Only the top card of each pile is available for play and can be moved to a pile or a foundation.
On the tableau, cards are played in descending order by alternate color.
An empty tableau can never be filled with any card.
The game is won when all cards end up in the foundations.