Beleaguered Castle Solitaire is a solitaire card game where the player places the four aces in the center of play as the four foundations. The foundations must be built up from Ace to King by suit. To the right and the left of each of the foundations is a pile of cards. Only the top card in each of these piles may be moved. Cards in the piles may be built down from King to Ace regardless of suit. Any card can be placed on an empty pile. The player wins when all 52 cards have been moved to the foundations.