1986年11月28日，《快樂城》（Castle Excellent / キャッスルエクセレント）在任天堂 Famicom（紅白機）上由ASCII開發與發行，是經典動作解謎遊戲《城堡探險》（The Castle）的強化續作。在1980年代中期的遊戲市場中，以「令人絕望的高難度」與「極致的邏輯考驗」聞名，是一款將平台跳躍與密室逃脫元素完美結合的硬核遊戲。它考驗的不僅是玩家的手眼協調，更對耐性、記憶力與策略能力提出極限挑戰。

延續前作簡潔的技術風格，但在關卡規模與複雜度上有大幅提升。場景設定在一座巨大的超級城堡中，共有100個房間。儘管紅白機的色彩受限，ASCII巧妙地利用紅、藍、黃、綠四種顏色的門與對應鑰匙，設計出一套縝密的邏輯鎖鑰系統。背景音樂雖單調循環，但在高難度解謎中營造出近乎催眠的緊張感。遊戲最吸引人的地方是其非線性地圖設計，所有房間互相連接，形成一個龐大的立體迷宮，挑戰玩家的記憶與規劃能力。

劇情延續傳統的「英雄救美」套路。玩家扮演拉斐爾王子（Prince Rafael），為了拯救被邪惡大魔王囚禁在城堡最深處的瑪格麗塔公主（Princess Margarita），必須單獨潛入這座充滿陷阱與守衛的魔城。城堡設計成複雜的機關迷宮，每一扇門、每道升降梯都暗藏致命危機。王子沒有強力遠程武器，必須依靠智慧、精準跳躍及收集的道具穿梭於房間之間，完成這場無聲的愛情冒險。

在操作方面，以極高的精準度要求著稱。城堡的門鎖系統需要玩家持有對應顏色的鑰匙，但鑰匙分布極為刁鑽，一旦使用錯誤或掉落至無法取得的位置，將陷入死局（Softlock），只能重新開始。跳躍具有明顯慣性，碰撞判定嚴苛，平台、消失磚塊與尖刺遍布，任何微小失誤都可能導致死亡。還需靈活運用氧氣瓶（潛水）、蠟燭（照明）與可推動石塊，石塊常用作踏板或觸發機關，但錯誤操作可能阻塞道路，使遊戲無法繼續。

在市場上獲得極端兩極化的評價。對熱愛精密操作與邏輯挑戰的硬核玩家而言，每一間房間的突破都帶來巨大的成就感，是難得的神作；但對普通玩家，其近乎病態的試錯成本與零容錯率，讓它被譽為「惡魔遊戲」。市場公認本作是1980年代「密室解謎動作（Action Puzzle）」類型的巔峰之作。它不依靠華麗特效取勝，而是憑藉100個精心設計的邏輯陷阱，在紅白機歷史上留下令無數玩家至今回想仍感「頭皮發麻」的經典印記。

Released on November 28, 1986, for the Nintendo Famicom, Castle Excellent (キャッスルエクセレント) was developed and published by ASCII as an enhanced sequel to the classic action-puzzle game The Castle. In the mid-1980s gaming landscape, it became notorious for its punishing difficulty and intricate logic-based design, standing out as a hardcore title that seamlessly fused platforming with escape-room-style puzzle solving. The game challenged not only players’ reflexes, but also their patience, memory, and strategic thinking to the absolute limit.

In terms of presentation, Castle Excellent retained the minimalist style of its predecessor but dramatically expanded the scale and complexity of its level design. The game takes place within a विशाल castle composed of 100 interconnected rooms. Despite the Famicom’s limited color palette, ASCII cleverly implemented a color-coded key-and-door system—red, blue, yellow, and green—to construct a tightly interwoven logical structure. The background music is simple and repetitive, yet during extended puzzle-solving sessions it creates a hypnotic tension that enhances the overall experience. One of the game’s most remarkable features is its non-linear map design, where every room connects into a vast, labyrinthine structure that constantly tests the player’s memory and navigation skills.

The story follows a classic “rescue the princess” premise. Players take on the role of Prince Rafael, who ventures alone into a deadly castle to save Princess Margarita, imprisoned deep within by an evil overlord. The castle itself functions as a massive mechanical puzzle box, filled with traps, elevators, and hidden mechanisms. With no powerful ranged weapons at his disposal, the prince must rely on intelligence, precise movement, and careful use of items to survive. The adventure unfolds as a quiet yet intense journey through a silent, hostile environment, driven by determination rather than spectacle.

Gameplay is where Castle Excellent truly defines its identity, earning a reputation as one of the most difficult titles on the Famicom. The color-coded key system requires strict resource management, as keys are scarce and often placed in unforgiving locations. Using the wrong key or losing one in an inaccessible spot can lead to a softlock, forcing the player to restart. Movement physics include noticeable inertia, and the collision detection is extremely unforgiving. Players must execute jumps with pixel-perfect precision while navigating moving platforms, disappearing blocks, and instant-death spikes. Additional items such as oxygen tanks (for underwater sections), candles (for dark rooms), and pushable stones introduce further layers of strategy. Stones, in particular, are central to puzzle-solving, but incorrect placement can permanently block progress.

Upon release, Castle Excellent received sharply divided reactions. Hardcore players praised its brilliant design and the immense sense of accomplishment gained from overcoming each room, often considering it a masterpiece of the genre. Meanwhile, more casual players were deterred by its extreme difficulty, unforgiving mechanics, and high trial-and-error cost, earning it the reputation of a “devil game.” Over time, it has come to be widely recognized as a pinnacle of 1980s action-puzzle design. Rather than relying on flashy visuals, it secured its legacy through 100 meticulously crafted logical challenges, leaving behind a lasting impression that still sends chills down the spines of retro gaming enthusiasts.