Play Klondike's triangular deal across two decks and ten piles, but build every run in a single suit, for a tougher climb and a 25% win rate.

Suit Triangle Solitaire is a two-deck Klondike relative that swaps the usual alternating-color tableau for single-suit sequences: everything you build and move has to match suit, not just color, and there's an extra tableau pile (ten instead of nine) to spread the triangular deal across. It's medium difficulty, with a 25% chance of winning, and how you do comes down to a mix of skill and luck.
If you like this one, Double Klondike Solitaire and Gargantua Solitaire scratch the same two-deck itch, and the original Solitaire is always there for the classic single-deck version.
If you run into anything odd or have an idea that would make the game better, please contact me.
Enjoy playing!
8 foundation piles: Build up from Ace to King in the same suit.
10 tableau piles: Build down in suit, not just alternating colors. Same-suit runs already in sequence move together as a group. Only a King, or a King-led run, can fill an empty pile. The first pile starts with one card, the second with two, and so on up to ten; only the top card of each pile is dealt face up, the rest face down.
Stock: Click to deal three cards to the waste pile. Redeals are unlimited.
Waste: The top card can be played to the foundations or the tableau.
Eight foundation piles hold the two decks. A card can join a pile only if it's one rank higher and the same suit as the pile's current top card, so the only card that can follow a 5 of diamonds is the 6 of diamonds. Each pile fills from ace to king, 13 cards deep.
You can also move a foundation's top card back into the tableau if a pile there will take it.
Ten tableau piles, dealt in a rising triangle: one card in the first pile, two in the second, three in the third, and so on up to ten in the last. Only the top card of each pile starts face up; the rest are dealt face down.
A card can be added to a pile only if it's one rank lower and the same suit as the pile's current top card, so the only card that could follow a 7 of diamonds is the 6 of diamonds. Because building requires matching suit, a same-suit run already in sequence can move together from one tableau pile to another.
Only cards that aren't covered by another card are free to move, onto a foundation or another tableau pile.
Only a King, or a same-suit run topped by a King, can fill an empty tableau pile.
There's one waste pile, and everything else starts in the stock. Click the stock to deal three cards at a time to the waste. You can go through the stock as many times as you need; if there aren't enough cards left for a full three near the end of a pass, you'll get whatever remains. Once the stock runs dry, the waste pile turns back into a fresh stock for the next pass.
The top card of the waste can be played to the tableau or a foundation.