空當接龍規則、思路與實戰要點
利用四個空位調度紙牌，將四種花色依序移入完成區。 本頁內容由 PocketJoy 測試團隊依照目前網頁版本的實際操作與勝負條件整理，並由 Long-Term New Media Limited 維護。
規則與勝負條件
全副 52 張牌一開始就全部正面朝上分成八列，沒有任何暗牌——這意味著理論上你掌握全部資訊，每一局都是一道確定有解或無解的謎題，而非碰運氣。牌列中的牌要按紅黑交替、點數遞減的順序疊放，例如紅 8 可以放到黑 9 上。右上方有四個空位(free cell)，每個可以暫存任意一張牌，這是整個遊戲的調度空間，也是它名字的由來。完成區則要從 A 開始按同花色依序收到 K。遊戲提供無次數限制的撤銷與自動收牌，重新發牌可以隨時開新局。一次能整體搬動的牌數不是固定的，而是由剩餘的空位與空列數量決定，遊戲會自動判定，你不需要自己計算。
打法與思路
空當接龍絕大多數的牌局都是可解的——在經典的微軟版本 32000 局裡，只有第 11982 局被證明無解——所以輸掉通常是次序問題而不是運氣問題，這一點對心態很重要。開局先不要急著動手，花點時間找出被壓在深處的 A 和 2，規劃怎麼把它們挖出來，尤其要看最深的那張 A 上面壓了幾張牌、這些牌各自能去哪裡。四個空位是最寶貴的資源，能一次搬動的牌數等於（空位數 + 1）乘以（空列數 + 1），所以「暫存一張牌」的代價比看起來高得多——每占用一個空位，你的整體搬運能力就下降一級，占滿四個空位時你一次只能移動一張牌。優先清空整列，空出來的列比空位更靈活，因為它可以放任意長度的牌組，而且在上面那個公式裡空列是乘數。中局的判斷準則是：每一步之前問自己，這一步能不能讓某張被埋住的關鍵牌露出來?如果不能，通常不值得走。
常見誤區
最致命的錯誤是把四個空位全部塞滿，此時只能一次移動一張牌，局面基本鎖死，而且往往無法回頭。動用第三、第四個空位之前，一定要先確認接下來如何把它清空——這是空當接龍最重要的一條紀律。另一個常見誤區是見到 A 就立刻收進完成區，再看到 2 也馬上收。低點數的牌留在牌列裡常常是接下來搬運的橋樑：你需要一張紅 3 來接黑 4，如果紅 3 已經被收進完成區就再也拿不回來了。比較安全的原則是，當兩種顏色的完成區都已經收到某個點數的前一位時，再收該點數的牌通常是安全的。第三個誤區是不用撤銷。空當接龍的撤銷沒有次數限制，可以一路退回開局，這是設計者刻意給的試錯空間，不用它等於自願放棄一半的容錯能力。第四是一開局就急著移動，沒有先整體掃描牌面，結果前幾步就把關鍵的空列機會浪費掉。
適合誰玩
適合喜歡完全資訊、講究規劃的人。因為沒有暗牌，也沒有運氣成分，每一局都是一道有解的謎題，輸了就是自己走錯順序，這種確定性對某些玩家非常有吸引力——你永遠不能怪牌運不好。空當接龍由 Paul Alfille 於 1978 年在 PLATO 教學系統上設計，1995 年隨 Windows 95 內建而廣為人知，微軟當時把它放進系統其實有個技術目的：用來測試和展示新的 32 位元圖形介面的穩定性。單局大約十到二十分鐘，比一般的克朗代克接龍更耗腦力，因為資訊完全公開意味著你沒有藉口不去計算。它適合想要安靜思考的場合，沒有時間壓力也沒有動畫催促，可以隨時停下來想很久。所有進度保存在本機，不需要帳號。
功能介紹
側欄即時顯示步數與完成區進度，讓你隨時知道整局的推進程度。「撤銷」按鈕沒有次數限制，可以一路退回開局，鼓勵你大膽嘗試不同路線而不必擔心一步走錯毀掉整局——這在空當接龍裡尤其重要，因為很多路線要走到中段才看得出對錯。「自動收牌」會把當前所有可以安全送入完成區的牌一次收完，省去終盤那段純機械的操作，讓你把時間花在真正需要思考的中盤。「重新發牌」隨時開新局。勝利畫面會確認所有 52 張牌都已歸位。搬動多張牌時，遊戲會依照剩餘空位與空列自動判定合法性，超出能力範圍的搬動不會被允許，你不需要自己套公式計算，但理解這個限制仍然有助於規劃。介面支援繁體中文與英文一鍵切換。
操作與本機紀錄
點選一張牌再點選目標位置即可移動；符合規則的連續牌組可以整體搬移，遊戲會依剩餘空位與空列自動判斷一次能搬幾張，不合法的搬動不會有反應。滑鼠與觸控操作完全一致，不需要拖曳，因此不存在手滑把牌丟到錯誤位置的問題，手機上牌面尺寸也經過調整以便單手操作。撤銷按鈕沒有次數限制，誤操作可以無成本回退。步數與勝利紀錄保存在瀏覽器的本機儲存空間，不上傳到任何伺服器、不需要帳號，清除瀏覽器資料會一併清空。語言按鈕可在繁體中文與英文之間即時切換，所有面板標籤與提示同步更新。頁面載入後即可離線遊玩，適合通勤或沒有網路的場合——因為單局時間較長，離線可玩這一點在飛機或地鐵上特別實用。
規則問答
空閒格一次能放幾張牌？
每個空閒格只能存放一張牌。
空列可以放任何牌嗎？
可以，空列可接收單牌或在移動能力範圍內的合法連續序列。
為什麼有些連續牌不能整組移動？
可移動數量由當前空閒格和空列共同決定；空間不足時必須拆開搬運。
搬運力怎麼算？見《新接龍規劃：自由格與空列的經濟學》。
內容審核：PocketJoy 遊戲測試團隊 · 營運：Long-Term New Media Limited · hklongtermad@gmail.com
FreeCell: rules, tactics and practical play
Use four free cells to organize the deck and build every suit to King. This guide reflects the controls and win conditions in the current browser build. It is reviewed by the PocketJoy game-testing team and maintained by Long-Term New Media Limited.
Rules and win conditions
All fifty-two cards are dealt face up into eight columns from the start, with nothing hidden — which means you have complete information in principle, and every deal is a puzzle with a definite answer rather than a gamble. Within a column, cards stack in descending order alternating red and black, so a red eight goes on a black nine. Four free cells at the top each hold a single card and provide all of your manoeuvring space, which is where the game gets its name. The foundations are built by suit from Ace up to King. Unlimited undo and auto-collect are available, and a fresh deal starts a new game at any time. The number of cards you can move as a unit is not fixed but determined by how many free cells and empty columns remain, and the game works this out for you.
Ideas and approach
The overwhelming majority of FreeCell deals are solvable — of the 32,000 numbered deals in the classic Microsoft version, only game 11982 has been proven unsolvable — so a loss is normally a sequencing error rather than bad luck, which is a useful thing to remember for your own composure. Do not touch anything at the start; spend a moment finding the Aces and twos buried deep in the columns and plan how to dig them out, paying particular attention to how many cards sit on the deepest Ace and where each of them could go. The four cells are your most valuable resource: the number of cards you can move at once equals one plus the free cells, multiplied by one plus the empty columns. Parking a card therefore costs far more than it appears — every occupied cell downgrades your carrying capacity, and with all four full you can move only one card at a time. Prioritise emptying an entire column, since an empty column is more flexible than a free cell and appears as a multiplier in that formula. A good mid-game test is to ask before each move whether it exposes a buried key card; if not, it is usually not worth playing.
Common mistakes
The fatal error is filling all four cells, at which point you can only move one card at a time, the position is effectively locked, and recovery is often impossible. Before using the third or fourth cell, be certain how you will clear it again — this is the single most important discipline in FreeCell. Another frequent slip is sending every Ace to the foundation the moment it appears, then the twos immediately after. Low cards left in the columns often serve as the bridge for your next sequence: you may need a red three for a black four, and a red three already on the foundation cannot be retrieved. A reasonably safe rule is that a card is usually fine to collect once both foundations of the opposite colour have reached one rank below it. The third mistake is neglecting undo. FreeCell's undo is unlimited and reaches back to the opening deal — deliberate room for experimentation from the designer — and ignoring it forfeits half your margin for error. The fourth is moving immediately without scanning the whole tableau, which frequently wastes the early chances to open a column.
Who it suits
A natural fit for players who like complete information and careful planning. With no hidden cards and no luck involved, every deal is a solvable puzzle and a loss is entirely your own sequencing — a certainty some players find very appealing, since you can never blame the cards. FreeCell was designed by Paul Alfille in 1978 on the PLATO educational computer system and became widely known when it shipped with Windows 95, where Microsoft had a technical motive for including it: it served to exercise and demonstrate the stability of the new 32-bit graphical interface. A game runs roughly ten to twenty minutes and asks more of you than ordinary Klondike, because complete information leaves no excuse for not calculating. It suits quiet, unhurried thinking, with no timer and no animation pressing you along. All progress stays on your device and no account is needed.
Features
The sidebar tracks your move count and foundation progress live, so the state of the game is always visible. Undo has no limit and can walk all the way back to the opening deal, which encourages experimenting with different lines without fear that one wrong move has ruined the game — particularly valuable in FreeCell, where many lines only reveal themselves as wrong halfway through. Auto-collect sweeps every card that can currently be sent safely to the foundations in one action, removing the purely mechanical clean-up at the end and leaving your time for the middlegame where the thinking actually happens. A new deal is always one tap away, and the victory screen confirms all fifty-two cards are home. When moving several cards, the game judges legality automatically from your remaining free cells and empty columns and refuses moves beyond your capacity, so you never need to apply the formula yourself — though understanding it still helps you plan. The interface switches between Traditional Chinese and English with a single button.
Controls and local records
Tap a card and then its destination to move it; legal sequences move as a unit, with the game calculating from your remaining free cells and empty columns how many cards can travel at once, and illegal moves simply not responding. Mouse and touch behave identically and no dragging is involved, so there is no risk of slipping a card onto the wrong pile, and card sizes are tuned for one-handed use on a phone. Undo is unlimited, making a mis-tap free to reverse. Moves and win records are stored in the browser's local storage — nothing is uploaded to any server, no account exists, and clearing browser data removes them. The language button switches between Traditional Chinese and English instantly, updating every panel label and prompt. Once loaded the game plays offline, which suits commutes and connection-free moments; because a game runs fairly long, offline play is genuinely useful on a plane or underground train.
Rules questions
How many cards fit in a free cell?
Each free cell holds exactly one card.
May any card enter an empty column?
Yes. An empty column may receive a single card or a valid run within the current move capacity.
Why can a valid run sometimes not move together?
The maximum transferable length depends on the available free cells and empty columns; with less space, the run must be moved in stages.
How moving power is counted: FreeCell Planning: The Economics of Free Cells.
Reviewed by the PocketJoy game-testing team · Operated by Long-Term New Media Limited · hklongtermad@gmail.com