Spread three decks across thirteen six-card piles, build down in any suit, and clear king-to-ace runs to twelve foundations for an 85% win rate.

Big Spider Solitaire is Spider Three Deck's roomier cousin: the same three-deck, 156-card pack, but spread across thirteen tableau piles instead of twelve, each dealt a flat six cards to start. You build down in any suit, only same-suit runs move together as a group, and a complete King-to-Ace run in one suit clears off to a foundation — with twelve such runs possible in the deck, there are twelve foundation piles waiting for them. It's medium difficulty with an 85% chance of winning, and skill carries most of the weight.
Other solitaire games comparable to this one include Spider Solitaire, Spider Three Deck Solitaire, and Huge Spider Solitaire, the four-deck member of the family.
If you run into anything odd or have an idea that would make the game better, please contact me.
Have fun playing!
13 tableau piles: Build down in any suit. Cards in sequence down in the same suit can be moved as a group. A gap can be filled by any card or valid set of cards. At the start of the game, each pile is given 6 cards. The top card is shown.
Stock: By clicking on the Stock, you can deal one card to each tableau pile. Before dealing, all tableau piles must be full.
There are twelve foundation piles.
Single cards are never allowed to be moved to the foundation. Only once you've built a complete sequence on the tableau, thirteen cards in order from ace to king, can you transfer it to the foundation.
The top card of each foundation can be moved back into play if another pile will accept it.
Thirteen tableau piles of six cards each. The top card in each pile is dealt face-up, while the remaining cards are dealt face-down.
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 six is a five of any suit.
Cards on the tableau that are not covered by another card can be played onto any other tableau pile.
Any card can fill an empty slot in the tableau.
If all cards are of the same suit, groups of cards in succession from high to low may be moved from one tableau column to another.
The stock is made up of leftover cards.
When you click on the stock, a card is dealt to the top of each tableau pile. Before you may deal cards, the tableau piles must be full.