四子棋
四子棋是經典 7×6 重力棋盤遊戲：把棋子落入欄位，橫向、直向或斜向連成四子。
世界與任務
Every disc changes both the visible threat and the future landing height of a column. A strong move creates a line while limiting the opponent's reply.
The direct Battle loop keeps the board readable from the first drop to the Result. Replay resets the board so a different opening can be tested immediately.
遊戲系統
The board has seven columns and six rows. A disc falls to the lowest open cell in its selected column; a full column cannot accept another disc.
A round ends when a player connects four discs horizontally, vertically, or diagonally, or when the board fills. Difficulty changes the AI response, not the win rule.
Hint highlights one tactical suggestion without auto-playing it; Undo restores the prior turn. Result offers Replay and Main, while local settings stay in this browser.
玩法說明
- 選擇難度，再選一欄落下你的棋子。
- 讀懂標示出的合法走法，規劃橫向、直向或斜向連成四子。
- 使用提示取得一個戰術建議，但不會自動替你落子。
- 在電腦之前連成四子，再用再玩一次或主畫面繼續。
策略提示
- Prefer the center columns early because they support more horizontal and diagonal lines.
- Before making a drop, check the opponent's next winning column as well as your own immediate threat.
- Avoid creating a winning-looking cell that gives the opponent a forced reply on the next turn.
關卡與難度成長
Easy, Medium, and Hard change the opponent's decision pressure while keeping the same 7x6 board and four-line win condition.
Replayable rounds make progress visible through better openings, safer blocks, and fewer forced replies rather than account levels.
開發設計理念
Four in a Row uses the shared Classic Logic Lab shell, a responsive 7x6 gravity board, AI-turn lock, advisory Hint, reversible Undo, Result recovery, and browser-local preferences.
玩家與存檔資訊
四子棋是一般玩家可遊玩的瀏覽器策略遊戲。不需要帳號或購買；設定與可用的最佳結果只保存在這個瀏覽器。
常見問題
- 棋子如何移動？
- 選擇尚有空位的欄位，棋子會落到最低的空格。
- 如何獲勝？
- 橫向、直向或斜向連成自己的四枚棋子。
- 進度會保存嗎？
- 設定與可用的最佳結果只保存在這個瀏覽器。
- 提示有什麼作用？
- 提示會標出一個戰術建議，但不會代替你落子。
- 棋盤填滿時會怎樣？
- 如果雙方都沒有連成四子，滿盤就會結束本局；結果頁可選擇重玩或回到主頁。
