Untangle two full decks across ten packed columns and eight free cells, one card at a time, since supermoves aren't on the table here.

Big FreeCell Solitaire takes the classic FreeCell idea and doubles it. Two full decks — one hundred and four cards — are dealt face-up across ten long columns, and eight open cells stand ready as temporary parking. Because every card is visible from the very start, the outcome rests almost entirely on how well you plan rather than on the shuffle.
The extra scale changes how the free cells feel. In standard FreeCell four cells are a scarce resource; here you have eight, but with more than twice the cards to untangle, they fill up just as fast. There's no shortcut for moving a run in one motion here: every move is a single card, so an empty column is where you park a card mid-shuffle while you walk a long sequence over one step at a time.
Unlike Double FreeCell, which funnels two decks into just four tall foundations, Big FreeCell keeps a full set of eight foundations — one for each suit in each deck — so every pile runs cleanly from Ace to King. Work the board evenly rather than emptying one column at speed, watch which cells you truly need, and try to clear a column early: an empty tableau space is worth far more than a full cell.
The game is comparable to FreeCell, Double FreeCell Solitaire, and Triple FreeCell Solitaire, other members of the open-builder family.
If you run into anything odd or have an idea that would make the game better, please contact me.
Have a good time playing!
8 foundation piles: Build up in suit from Ace to King. Cards move here automatically when they are ready.
8 cells: Each cell holds one card, which can later be played to the foundations or the tableau.
10 tableau piles: Alternate color build down. Only one card moves at a time — there's no dragging a whole run in one go. Any card can fill an empty column. At the start the whole double deck is dealt out face-up, so each pile holds ten or eleven cards.
There are eight foundation piles, all starting empty.
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 6 of diamonds is a 7 of diamonds. Each pile is complete once it runs from Ace up to King.
The top card of each foundation can be moved back into play if another pile will accept it.
Eight cells, all originally empty.
One card can be stored in each cell. Any available card can be played into any open cell, and cell cards can be played back to the tableau or the foundation.
Ten tableau piles dealt from the full two-deck pack, every card face-up, so some piles hold ten cards and some eleven.
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 a 9 of diamonds are the 8 of spades and 8 of clubs.
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.
Only one card moves at a time — Big FreeCell doesn't offer the supermove shortcut some FreeCell variants do. Free cells and empty columns still matter just as much; you just walk a run over individually instead of dragging it in one motion.