Untangle four decks, 208 cards, sixteen foundations, and fourteen tableau piles, every card dealt face up with nothing hidden. A slow, patient challenge for serious FreeCell fans.

FreeCell Four Deck Solitaire pushes the format about as far as it goes: four decks, sixteen foundation piles, fourteen free cells, and fourteen packed tableau piles to sort through. Every one of the 208 cards is dealt face-up from the start, so there's nothing hidden and nothing to wait on, just a long, patient untangling job for people who like sinking real time into a single deal.
The rules are plain old FreeCell: build the tableau down in alternating colors, and use the free cells to shuffle cards around one at a time. For less to manage, FreeCell Three Deck Solitaire drops a deck and two tableau piles, or go the other way with just two decks in FreeCell Duplex Solitaire.
If you run into anything odd or have an idea that would make the game better, please contact me.
Have fun playing!
There are sixteen foundation piles.
Any ace in the foundation may be transferred to any vacant pile.
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 spades is a 5 of spades. 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.
Fourteen cells, all of which are originally vacant.
One card can be stored in each cell. Any available card can be played into any available cell. Cell cards can be played back to the tableau or the foundation.
Fourteen tableau piles of cards, the first twelve of which have fifteen cards apiece and the following two of which have fourteen cards each. Every card is dealt face-up.
A card can be added to a tableau pile only if it's one rank lower and the opposite color of the pile's current top card, so the only cards that fit on the 4 of clubs are the 3 of hearts and 3 of diamonds.
Cards on the tableau that are not covered by another card can be played onto the foundation, an empty cell, or any other tableau pile.
Any card can fill an empty slot in the tableau.