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FreeCell

FreeCell is a solitaire card game played with a standard 52-card deck, fundamentally distinct from most other solitaire variants due to its high solvability rate—nearly all deals can be won with optimal play when sufficient free cells and empty cascades are available. The game features eight tableau columns where all cards are dealt face-up at the start, four free cells for holding single cards temporarily, and four foundation piles built upward in suit from Ace to King.^[1] Invented by Paul Alfille in the mid-1970s while he was a student at the University of Illinois, FreeCell originated as a computer implementation written in the TUTOR programming language for the PLATO educational system, evolving from an earlier game called Baker's Game by relaxing the same-suit building rule to alternating colors.^[2]^[3] Alfille's version modified the building rule to alternating colors, allowing players to maneuver cards more freely and emphasizing strategy over luck compared to games like Klondike Solitaire.^[4] Microsoft significantly popularized FreeCell by including it in the second volume of the Microsoft Entertainment Pack released in 1991, and later bundling it directly with Windows 95 in 1995, where it became a pre-installed staple alongside Solitaire and Minesweeper.^[5]^[3] This integration exposed the game to millions of users, turning it into a cultural touchstone for early personal computing and inspiring numerous variants, online versions, and solver algorithms that demonstrate its mathematical solvability—over 99.99% of random deals are winnable.^[6]

Rules and Gameplay

Objective and Setup

FreeCell is a solitaire card game played with a standard 52-card deck, where the primary objective is to build four foundation piles, one for each suit (hearts, diamonds, clubs, and spades), starting with the ace and ascending to the king in strict suit sequence.^[7]^[8] The game is won when all 52 cards have been successfully moved to these foundation piles, which begin empty and can only be built upon in ascending order by suit.^[9]^[10] At the start of the game, the entire deck is dealt face-up into eight columns known as the tableau, providing full visibility of all cards from the outset—a key distinction from many traditional solitaire variants where some cards are initially face-down.^[9]^[11] The tableau is arranged such that the first four columns each contain seven cards, while the last four columns each contain six cards, totaling 52 cards with the top card of each column exposed for play.^[9]^[12]^[13] This setup, combined with four empty free cells that serve as temporary storage for single cards, establishes the strategic framework for the game.^[7]^[14]

Building and Moving Cards

In FreeCell, cards in the tableau are built in descending order with alternating colors, such as placing a red 7 on a black 8, allowing players to create sequences by moving the exposed top card of one column to the exposed top card of another column only if the sequence rule is followed.^[15]^[16]^[17] Without available free cells or empty columns, only a single card can be moved at a time between tableau columns.^[15]^[16] The foundations, located at the top of the layout, begin with aces moved from the tableau, and subsequent cards are added in ascending order within the same suit, such as placing the 2 of hearts on the ace of hearts, with moves permitted only from the exposed ends of tableau columns or free cells to the appropriate foundation pile.^[15]^[16]^[17] Legal moves are restricted to the exposed cards at the ends of columns or foundations, ensuring that any relocation adheres to the descending alternate-color rule for the tableau or the ascending same-suit rule for the foundations.^[15]^[16]^[17] Empty tableau columns function similarly to free cells by allowing the placement of a single card, thereby enabling temporary holds that facilitate further building in the tableau.^[15]^[16]^[17]

Free Cells and Supermoves

In FreeCell, four free cells serve as temporary holding spaces, each capable of storing a single card to facilitate maneuvering within the tableau by temporarily removing cards that block sequences.^[18] This mechanic allows players to break down larger builds into manageable parts, effectively expanding the flexibility of card movements beyond what would be possible in a fully occupied tableau.^[19] Supermoves extend the basic rule of single-card transfers by permitting the relocation of multiple consecutive cards as a single unit, provided there are sufficient free cells and empty columns to theoretically support the sequence through a series of individual moves.^[18] For instance, with all four free cells empty and no empty columns, a player can move up to five cards in a valid descending, alternating-color sequence to another column.^[20] Empty columns amplify this capacity, as they can hold entire sequences temporarily, enabling more complex rearrangements akin to using auxiliary stacks.^[19] The maximum number of cards movable in a supermove is calculated as (f + 1) \times 2^e, where f is the number of empty free cells and e is the number of empty columns (excluding the destination).^[20] This formula arises from a binary tree analogy for temporary storage: each empty column effectively doubles the movable length by allowing recursive subdivision of the sequence into sub-stacks that can be shuttled back and forth, similar to branching in a binary structure.^[19] For example, with four empty free cells and one empty column, up to ten cards can be moved, though such scenarios are rare due to the game's layout.^[18] In practice, supermoves are limited to 5-6 cards per transfer in most situations, as early-game configurations typically offer few empty columns, and the automation simplifies what would otherwise require dozens of single-card steps.^[20] This efficiency is a hallmark of digital implementations, streamlining gameplay while preserving the underlying single-move logic.^[19]

Specific Deals and Challenges

Numbered Hands

Numbered hands in FreeCell refer to a standardized set of 32,000 unique deals introduced in the original Microsoft FreeCell game released in 1991 as part of the Microsoft Entertainment Pack 2 for Windows 3.0. These deals were created to ensure reproducible gameplay, allowing players and developers to reference specific layouts without ambiguity.^[21]) The deals are generated algorithmically using a pseudorandom number generator seeded with the deal number, typically a 15-bit value ranging from 1 to 32,000. The process involves initializing a standard 52-card deck, then shuffling and dealing the cards across eight columns by repeatedly selecting a random card from the remaining deck (swapping it with the last card if necessary) and placing it face-up in sequence until all cards are distributed. This method produces varied layouts, with the vast majority solvable under standard rules, though difficulty fluctuates rather than increasing progressively. Later versions of FreeCell expanded to 1,000,000 deals using similar seeding, including some unsolvable ones among higher numbers.^[22]^[23] In most FreeCell software implementations, players can access these deals by entering the desired game number via a menu option, such as "Game > Select Game" in the original Microsoft version, which loads the exact layout generated from that seed. For example, Deal 164 is considered relatively easy, often solvable in fewer moves with straightforward sequences, while Deal 1941 presents a significant challenge requiring careful use of free cells and cascades but remains winnable.^[23] These numbered hands serve primarily to benchmark player skills, test solver algorithms, and facilitate community discussions, as the fixed seeds enable consistent comparisons across different platforms and versions without relying on random generation.^[22]^[23]

Unsolvable Hands

In the collection of 32,000 predefined deals included in the original Microsoft Windows FreeCell implementation, only one deal, numbered 11,982, has been confirmed as truly unsolvable under optimal play with the standard rules.^[24] Earlier reports of additional unsolvable deals within this set were often due to limitations in initial computer solvers, which failed to find solutions for particularly challenging but ultimately winnable configurations; modern exhaustive solvers have since verified the solvability of all others.^[24] This rarity underscores FreeCell's design as a highly solvable solitaire variant compared to others like Klondike.^[24] Unsolvable deals typically feature intricate blockages that prevent the liberation of essential cards, such as aces or low-ranking cards needed to initiate foundation building, often because they are buried under sequences incompatible with available cascade moves or freecell holdings.^[24] In deal 11,982, for instance, the initial layout restricts viable early moves to such an extent that no sequence of legal actions can expose key cards without additional temporary storage beyond the four freecells and cascades provided; adding just one extra freecell renders it solvable, highlighting how marginal space constraints create deadlocks.^[24] These characteristics emphasize patterns like covered aces or limited initial descending sequences that exhaust the game's holding capacity before progress can be made.^[24] The identification of unsolvable deals like 11,982 stemmed from exhaustive computer searches conducted by solitaire enthusiasts and researchers in the late 1990s and early 2000s, using depth-first search algorithms to explore all possible move trees.^[24] Organizations such as the Solitaire Laboratory compiled lists of suspected hard deals and subjected them to repeated solver runs, confirming 11,982's status after extensive verification that no solution path exists.^[25] Such discoveries relied on the numbered hand system, which standardizes deal generation for reproducibility across implementations.^[25] The existence of these rare unsolvable hands illustrates inherent limitations in FreeCell's mechanics, where even perfect play cannot overcome certain spatial bottlenecks, prompting refinements in game generation algorithms to minimize such occurrences in later versions.^[24] For randomly generated deals, advanced solvers estimate a solvability rate of approximately 99.999%, with only about 12 unsolvable positions per million, reinforcing the game's reputation for near-universal winnability under optimal conditions.^[24]

History and Variants

Origins and Development

FreeCell originated as a digital adaptation of the solitaire variant known as Baker's Game, which was invented by mathematician C. L. Baker and first documented in the June 1968 issue of Scientific American.^[26] In 1978, Paul Alfille, then a medical student at the University of Illinois, developed the initial computer implementation of FreeCell on the PLATO educational computing system using the TUTOR programming language.^[27] Alfille modified Baker's Game by allowing tableau sequences to be built in alternating colors rather than the same suit, introducing the four "free cells" that hold single cards temporarily to facilitate longer moves.^[4] This change made the game more accessible and strategic, earning it the name "FreeCell" directly from those holding cells.^[3] By the early 1980s, FreeCell began circulating beyond academic systems when Control Data Corporation distributed versions on their mainframe computers.^[28] In 1988, Jim Horne, a Microsoft programmer who had encountered the game on PLATO during his time at the University of Alberta, released a shareware DOS version featuring color graphics and improved interface, marking its first widespread public availability for $10.^[2] Horne's implementation preserved Alfille's core mechanics while enhancing playability on personal computers, helping to build a dedicated following among early PC users.^[29] FreeCell's popularity grew with its inclusion in the Microsoft Entertainment Pack 2 in 1991, where Horne ported the game to Windows and introduced 32,000 predefined deals to ensure variety and solvability testing.^[22]^[30] Its global popularity surged further in 1995 with bundling in Microsoft Windows 95. This integration transformed it from a niche program into a digital staple, pre-installed on millions of systems and often used to demonstrate mouse functionality. Subsequent Windows versions from 95 through XP retained the game as pre-installed, while versions from Vista (2007) onward offered it as an optional download or through the Microsoft Solitaire Collection app, solidifying its role in computing culture.^[31]^[32] Over the following decades, FreeCell was ported to diverse platforms, including mobile devices and web browsers, expanding its reach while maintaining the original rules established by Alfille and Horne.^[3] These adaptations, often featuring touch controls or online multiplayer elements, have kept the game relevant in the modern era.^[33]

Notable Variants

Baker's Game, invented by mathematician C. L. Baker, serves as a direct predecessor to FreeCell and was first published in Martin Gardner's "Mathematical Games" column in the June 1968 issue of Scientific American.^[26] It uses the same setup as FreeCell with four free cells and eight tableau columns but requires descending sequences to be built in the same suit rather than alternating colors, significantly increasing difficulty by limiting move options.^[34] This stricter building rule makes Baker's Game harder to solve, with far fewer deals winnable compared to standard FreeCell.^[35] Eight Off is another prominent variant that modifies the free cell mechanic for a different strategic focus, dealing 48 cards into eight tableau columns of six cards each, with the remaining four cards placed one each into the first four of eight available free cells.^[36] Like Baker's Game, it builds descending sequences in the same suit only, but the additional free cells allow for more temporary storage, partially offsetting the suit restriction; however, empty tableau columns can only receive kings, preventing broad use of empty spaces for large moves.^[37] This setup shifts emphasis toward column-based building and precise cell management, emerging as a variation of Baker's Game to balance accessibility with challenge.^[38] ForeCell, a Swedish solitaire predating FreeCell, adapts the layout by dealing all 52 cards face-up into eight tableau columns of six cards each, with four free cells starting fully occupied by one card each.^[39] Building occurs descending in alternating colors on the tableau, similar to FreeCell, but the initial filling of all free cells eliminates supermoves at the outset, requiring players to empty cells first and heightening early-game difficulty.^[40] Foundations build up in suit from ace to king, and the game traces its origins to a 1945 book titled Napoleon at St. Helena, later adapted and renamed for digital collections like Pretty Good Solitaire.^[39] Digital adaptations introduce further modifications for varied playstyles, such as Relaxed FreeCell, which permits moving any properly sequenced group of cards regardless of available free cells or empty columns, easing restrictions to enhance flow and reduce frustration.^[41] Multi-deck versions like Double FreeCell double the cards to 104, using eight free cells and more columns to scale complexity for extended sessions.^[42] Software like Pretty Good Solitaire incorporates themed variants with custom visuals and rules tweaks, broadening appeal across platforms.^[43] Community modifications extend FreeCell through custom deal generators that produce deals beyond the original 32,000, allowing infinite replayability and analysis via tools like the FreeCell Solver.^[44] Timed challenges add urgency by limiting move durations, fostering competitive play in online forums and apps.^[44]

Solving and Analysis

Player Strategies

Players should prioritize moving Aces and Deuces to the foundation piles as soon as they are uncovered, as this frees up space in the tableau columns and allows for the construction of suit-based sequences from low to high cards.^[45] However, players must avoid committing higher cards to the foundations prematurely, since these cards may be required later to facilitate the movement of buried lower cards or to build longer descending sequences in the tableau.^[46] Effective management of the four free cells is crucial for maintaining flexibility during play; these cells should be used sparingly, primarily for holding single cards when no other moves are available, as filling them reduces the ability to perform longer supermoves.^[45] Instead, players are advised to reserve empty tableau columns for relocating large sequences, leveraging the free cells and empty columns to enable moves of up to (number of free cells + 1) × 2^(number of empty columns) cards at once.^[47] In sequence planning, players benefit from identifying opportunities to create empty tableau columns early, which allows for the relocation of descending, alternating-color sequences starting from high cards like Kings; additionally, spreading cards evenly across columns and looking for parallel builds in multiple tableau areas can uncover more viable moves.^[46] When playing on software implementations, utilizing the undo feature to reverse risky moves helps in experimenting with different sequence arrangements without permanent consequences.^[46] A common pitfall is over-relying on supermoves, which can lead to deadlocks if they block access to necessary cards; to mitigate this, players should aim to keep at least one free cell open at all times to preserve options for single-card maneuvers and avoid filling all free cells unnecessarily.^[45] For advanced play, players should routinely scan the tableau for buried Aces or Kings that may impede progress, prioritizing moves that uncover these blockers before committing to other actions.^[46] Practicing on easy numbered deals, such as those labeled 164 or 7058 in standard FreeCell implementations, builds familiarity with these heuristics and improves overall solving efficiency.^[48]

Computational Complexity

The standard single-deck FreeCell game exhibits high solvability for random deals, with a 2018 exhaustive analysis of 8.6 billion configurations by Pringle and Fish revealing a win rate of approximately 99.9988% (102,075 unsolvable deals), confirming that nearly all such deals can be solved with optimal play.^[49] This near-perfect solvability arises because the four free cells and empty cascades enable sufficient maneuverability to avoid deadlocks in most initial layouts, as verified through complete enumeration of move sequences in these searches. In contrast, certain numbered deals from the original Microsoft implementation, such as #11982 among the first 32,000, are provably unsolvable, as no sequence of legal moves leads to victory despite exhaustive analysis.^[50] The computational complexity of FreeCell varies by variant. The generalized form, using 4×n cards instead of a fixed 52-card deck, is NP-complete, as established by Helmert (2003) who proved NP-hardness in the context of planning domains.^[51] For the standard single-deck version, solvability falls within P, as the number of reachable states from a typical deal is on the order of hundreds of thousands to millions, permitting polynomial-time resolution via algorithms like breadth-first search (BFS) or A* with admissible heuristics, though the high-degree polynomial makes brute-force impractical without optimizations.^[24] Early solvers emerged in the 1990s amid the popularity of Microsoft's FreeCell, with collaborative efforts like the Internet FreeCell Project using rudimentary computer programs to exhaustively verify that all but one of the 32,000 predefined deals were solvable.^[52] Modern open-source tools, such as FC-Solve developed by Shlomi Fish starting in 2000, incorporate heuristics like pattern databases to accelerate searches, enabling rapid analysis of vast state spaces while confirming unsolvability for exceptions like deal #11982 in mere seconds via depth-first search (DFS). Key algorithms in these solvers rely on DFS augmented with supermove pruning, which treats sequences of buildable cards as single atomic moves to drastically reduce the effective branching factor—typically from dozens per state to a manageable few, further aided by the free cells that limit redundant explorations.^[53]

References

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FreeCell Rules - Klondike
The object of the game is to build all the cards face up on the foundations. Each foundation builds upward, in sequence, starting with the Ace.
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The original Freecell game was created by Paul Alfille in the mid 1970's. It was written in TUTOR, a programming language specifically designed for the ...
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Rating 5.0 (29) · $19.95 · GameThe original Freecell game was invented by Paul Alfille, who developed it from Baker's Game. In 1978, he created the first computer implementation of the ...
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1991, 1995–2001. FreeCell was first included in the second volume of the Microsoft Entertainment Pack. The game would be bundled with Windows 95 and later ...
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... Solitaire. We marked Windows milestones by their Solitaire variants. Windows NT gave us FreeCell, which we loved because almost every game was winnable. Windows ...
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The goal of FreeCell Solitaire is to move all cards to the foundation piles, building them from Ace to King, to win the game.
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Jan 7, 2016 · The goal of the game is to move all the cards to the four Foundation piles (located in the top right) and build each suit up from Ace to King.Missing: rules | Show results with:rules
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Tableau: The tableau has all 52 cards placed face up in eight columns. The first four columns have seven cards and the next four columns have six cards.
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FreeCell's goal is to move all 52 cards to the foundation using four free cells. The tableau has 8 columns, and the foundation is sequenced Ace to King by suit.
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Unlike other versions, Freecell's tableau is all face-up, so you can build sequences while alternating colors (red and black) as you go. How to Play Freecell.
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Shuffle and Deal: Upon selecting your mode, the cards are shuffled, and the game initiates with eight tableau columns. The first four columns have seven cards ...
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The game is played with a single pack of 52 playing cards. ... eight columns of six cards each. The final four cards are dealt to the first four columns ...
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Cards may be moved to the foundation from the tableau or a free cell. Any card may be moved to an empty free cell or an empty tableau column. A card may be ...
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Rating 5.0 (192) Each cell may contain only one card. Cards in the cells can be moved to the foundation piles or back to the tableau piles, if possible. Freecell Solitaire Game ...
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Most of the time, the maximum number of cards in a sequence that can be moved from one Column to another is the number of empty Freecells plus one. However, ...
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Baker's Game is named after the mathematician C.L. Baker and was first published in Martin Gardner's June 1968 Mathematical Games column in Scientific American.
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Baker's Game is similar to FreeCell, but cards are sequenced descending by suit. Build four foundation piles to win. Play online for free today!
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Shuffle the deck and lay out 48 cards in eight tableau piles, face up and fanned down, so that there are six cards in each tableau.
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Eight Off emerged from a variation of Baker's Game. In Baker's Game the rules are exactly the same as in Eight Off, but it has only 4 free cells to move. The ...Missing: origin | Show results with:origin
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Eight Off Solitaire
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How to Play ForeCell Solitaire, the FreeCell type solitaire game included in Pretty Good Solitaire ... Variations of ForeCell. FreeCell. Baker's Game.Missing: variants | Show results with:variants
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One of many games known as Napolean at St. Helena, ForeCell is a Swedish variant that predates FreeCell with a different layout and only permitting tableua ...
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This game is similar to Freecell, but you can move a group of cards in the proper sequence as a unit, regardless of the number of freecells available.
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Play 1080 different solitaire card games, from classic games like Klondike, FreeCell, and Spider, to original games found nowhere else.Download · Play Solitaire Online · Pretty Good Solitaire Mac Edition · FreeCell Plus
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Below you will find some simple rules that can help you to win FreeCell on more regular basis. Some FreeCell Solitaire deals are solvable very quickly.
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The original Microsoft FreeCell package included 32,000 deals generated by a random number seed. These deals are known as the "Microsoft 32,000." Later ...
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Game 11982 - FreeCell solutions
6♢, 10♧, 4♤, 7♤. J♢, 7♢, 8♥, 9♧, 2♥, Q♢, 4♧, 5♥. K♧, 8♢, 2♤, 3♤. If this is your game then the solution below: This game is unsolvable. © 2008 - 2025 ...Missing: FC- | Show results with:FC-
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Freecell Solver is an open source library and some command line applications, for automatically solving several variants of card Solitaire / Patience games, ...Online Freecell solver · FAQ · Freecell Deal Finder · Don Woods' Solver