Move 156 cards across thirteen same-suit piles, shifting any grouping as one. It's medium difficulty, but only 20% of deals get won.

Thomas Warfield's three-deck take on Russian Solitaire spreads 156 cards across thirteen tableau piles and twelve foundations, and everything builds in a single suit rather than alternating colors. That same-suit rule makes new runs harder to start, but it also lets you shift almost any grouping of cards at once, in sequence or not, so patient planning beats blind luck. You'll come out on top in 20% of games here, a medium-difficulty rate where skill outweighs luck.
If you'd rather start smaller, Double Russian Solitaire keeps the same-suit tableau rule but with two decks instead of three. Triple Yukon Solitaire is another one of Thomas Warfield's three-deck marathons, built to the same size but with an alternating-color tableau instead.
Switch to the classic Spider Solitaire for the same single-suit focus without three decks in the mix.
If you run into anything odd or have an idea that would make the game better, please contact me.
Enjoy the game!
12 foundation piles: Build up from Ace to King in the same suit.
13 tableau piles: Built down in the same suit. Groups of cards can be moved together even when they aren't in sequence. Fill in the blanks with Kings or groupings of cards led by a King. To start, each of the first nine piles gets one more face-down card than the last, one in the first pile up to nine in the ninth, with six face-up cards on top of every pile in that group. The last four piles are dealt much deeper, buried under just a single face-up card each.
There are twelve foundation piles.
Any Ace may be moved onto an empty foundation pile to start it.
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 a 4 of clubs is a 5 of clubs. There can be no more than 13 cards in a pile.
The top card of each foundation can be moved back into play if another pile will accept it.
Thirteen tableau piles are dealt: the first nine piles receive one through nine face-down cards respectively, each topped with six face-up cards, while the last four piles hold eleven, thirteen, fourteen, and fifteen face-down cards under a single face-up card apiece.
A card can be added to a tableau pile only if it's one rank lower and the same suit as the pile's current top card, so the only card that fits on a 9 of clubs is an 8 of clubs.
Cards on the tableau that are not covered by another card are free to be played onto the foundation or any other tableau pile.
Only kings may fill empty spots in the tableau.
Furthermore, any face-up card in the tableau may be transferred to another tableau column where it fits, bringing all cards on top of it with it.