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Two decks, eight suited foundations climbing up while your tableau builds down: Incompatibility flips Spider's goal and keeps you guessing.

Incompatibility Solitaire is a two-deck spin-off of Spider that swaps the familiar goal on its head. Instead of building long descending runs and sweeping them away, you feed cards one at a time up to eight suited foundations, from Ace all the way to King. The tableau is only a staging ground, and the trick is arranging it so the right card is exposed at the right moment.

The name is well earned. Because the foundations climb in suit while the tableau builds down in any suit, the two halves of the board are always working against each other. A card you would love to promote is often buried under a mismatched pile, and freeing it means shuffling everything above it somewhere else first.

There is no waste pile and only a single deal through the stock, and it comes with a sharp edge: the stock deals one card onto every column that still holds cards, but skips any empty column entirely. Clear a column too soon and you lose that landing spot for the next deal, so open spaces are as much a liability as an opportunity in the early game.

If the up-building foundations frustrate you, the pure descending challenge of Spider Solitaire is only a click away. For the straight version of this exact layout, Black Widow Solitaire uses the same two decks and ten tableau piles but sends runs to the foundations the normal Spider way.

If you run into anything odd or have an idea that would make the game better, please contact me.

Enjoy playing!

How to play Incompatibility Solitaire

Layout:

8 foundation piles: Build up in a single suit from Ace to King. Cards are promoted one at a time; there is no completed-sequence removal.

10 tableau piles: Build down in any suit. Each pile is dealt five cards, four face-down and one face-up on top.

Stock: Click to deal one card to each tableau pile that still contains cards. Empty columns are skipped, and there is a single deal with no redeals.

Foundation:

There are eight foundation piles, one for each suit in each of the two decks.

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 spades is a 9 of spades. Aces start every foundation and Kings finish them.

The top card of each foundation can be moved back into play if another pile will accept it.

Tableau:

Ten tableau piles of five cards each. Only the top card of each pile begins face-up; the four cards beneath it are 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, and its suit doesn't matter, so the only card that fits on an 8 is any 7.

A group of cards can be lifted and moved together only when it forms a descending run of a single suit; otherwise cards move one at a time. When you clear the exposed card from a pile, the face-down card beneath it turns face-up automatically.

Any card or valid suited run may be placed onto an empty column, which makes empty spaces a useful place to park cards you need out of the way.

Stock and waste:

The stock holds the cards left over after the deal, and there is no waste pile.

When you click the stock, one card is dealt to every tableau column that is not empty; columns with no cards receive nothing. There is only one pass through the stock and no way to reshuffle.