Double Beleaguered Castle to two full decks: eight foundations, twelve tableau piles, and a friendly 80% win rate where skill beats luck.

Chateau Solitaire doubles Beleaguered Castle Solitaire up to two decks: eight foundation piles instead of four, twelve tableau piles instead of eight. The game is medium in difficulty, with an 80% chance of winning. It's played with two decks, and skill matters more than luck here.
If you run into anything odd or have an idea that would make the game better, please contact me.
Have fun playing!
8 foundation piles: Build up from Ace to King in the same suit. Each pile starts with its ace already in place.
12 tableau piles: Build down in any suit. Runs in sequence can move down regardless of suit. Only a King or a run led by a King may fill a space. At the start of the game, each pile is dealt 8 cards face-up.
There are eight foundation piles, and each one starts with its ace already in place.
A card can be added to a foundation pile only if it's one rank higher and the same suit as the pile's current top card, so the only card that fits on an 8 of hearts is a 9 of hearts. No pile can hold more than 13 cards.
The top card of a foundation pile can be moved back into play if a tableau pile will accept it.
Twelve tableau piles hold eight cards each, all dealt face-up.
A card can be added to a tableau pile only if it's one rank lower than the pile's current top card, regardless of suit, so the only card that fits on a five is a four of any suit.
Any uncovered tableau card can be played onto the foundation or another tableau pile.
Only a King, or a run led by a King, may fill an empty tableau spot.
Runs of cards in sequence from high to low can move from one tableau pile to another, regardless of suit.