The primary goal in Castle Mount Solitaire is to move all cards to the twelve foundation piles, building each foundation up by suit from Ace to King.
Foundations:
Each foundation is built up by suit from Ace to King (e.g., Ace♠, 2♠, 3♠, …, King♠).
Only cards of the same suit and one rank higher than the current top card can be placed on a foundation (e.g., 3♦ on 2♦).
Tableau:
Each tableau pile builds down by rank, regardless of suit (e.g., 7♠ on 8♣, 6♦ on 7♠).
Any card may be moved to an empty tableau pile.
Sequences of cards built down by the same suit may be moved together as a group from one tableau pile to another.
Card Movement:
Only the top card of each tableau pile, or a valid sequence, may be moved at any time.
No cards can be moved directly from one foundation to another or back to the tableau.
Turn Structure:
On each turn, the player may move any available card or valid sequence from one tableau pile to another, following the building rules.
The player may also move any eligible card to a foundation pile if it continues the sequence by suit and rank.
When a tableau pile becomes empty, any card or valid sequence may be moved into the space.
Introducing New Cards:
There is no stock; all cards are available and visible from the start. New cards are introduced into play only as cards above them are moved, exposing lower cards in each tableau pile.
No Moves Available:
If the player cannot make any further legal moves (i.e., no cards can be moved to a foundation or between tableau piles), the game ends in a loss.
Winning:
The game is won when all 156 cards are moved to the twelve foundation piles, each built up in suit from Ace to King.
Losing:
The game is lost (unwinnable) if no legal moves remain and not all cards have been placed on the foundations.
Empty Tableau Piles:
Any card or valid sequence may be moved into an empty tableau pile. There are no restrictions on which card or sequence can fill an empty space.
Moving Sequences:
Only sequences built down by the same suit may be moved together as a group. Sequences built down by mixed suits must be moved one card at a time.
No Stock or Redeal:
There is no stock, reserve, or redeal. All cards are in play and visible from the start of the game.
Skill and Odds:
The game is considered mostly skill-based, with an estimated win rate of about 30%.
Definitions of Key Terms:
This ruleset reflects the official gameplay mechanics for Castle Mount Solitaire as described by leading solitaire authorities and rulebooks.