《航海王：海賊無雙4》（日文：ワンピース 海賊無双4，英文：One Piece: Pirate Warriors 4）是由BANDAI NAMCO發行、由Omega Force開發的動作無雙類遊戲，Nintendo Switch版於2020年3月26日與其他平台同步發售。《海賊無雙》系列的第四代正統續作，結合《航海王》的角色與劇情魅力，與無雙系列標誌性的「一敵百」爽快動作系統，是高度粉絲向、同時也能吸引無雙類新玩家的作品。

在劇情方面，以動畫《航海王》的長篇劇情為主幹，從早期的「阿拉巴斯坦篇」、「司法島篇」、「頂上戰爭篇」一路到較新的「圓蛋糕島篇」與「和之國篇」皆有收錄，涵蓋魯夫與草帽一行人經歷的重要轉折與經典戰役。值得一提的是，並未拘泥於完全重現動畫劇情，而是在「和之國篇」採用原創劇情結局，先行體驗對抗凱多的最終決戰氛圍。每位登場角色皆有專屬故事任務與過場動畫，讓玩家能隨著推進主線回味動畫的感動與熱血。

操作系統方面，在無雙動作基礎上進行不少優化與革新，目標是讓戰鬥更加自由、立體與刺激。可操作超過40名以上的角色，每名角色皆有專屬招式、覺醒技能與技能樹成長系統。操作上維持輕攻擊與重攻擊組合連段的基本結構，同時新增「空中動作」與「技能裝備系統」。空中動作讓戰鬥跳脫平面，能在空中連段、閃避與施放招式，戰場節奏更為靈活。技能系統則允許配置多種必殺技，依據角色定位（如力量型、技巧型、空中型等）打造出不同打法。例如魯夫可在戰鬥中自由切換「二檔」與「四檔」形態，火拳艾斯則擅長範圍燃燒攻擊，讓操作風格極具個性與視覺衝擊。

在操作與表現方面表現不俗，在解析度與部分特效表現上優於於Switch或PC版本，整體流暢度穩定，且支援單機雙人合作與本地連線，無論是掌機還是電視模式都能提供爽快戰鬥體驗。由於支援最多4人連線合作，能在線上與好友共闖劇情或挑戰任務，加強重玩價值。

就市場評價而言，自發售以來獲得普遍好評，特別在粉絲群體中反應熱烈。媒體與玩家多認為本作是系列中完成度最高的一作，不僅角色數量豐富、劇情選材涵蓋面廣，戰鬥系統也相較前作更為成熟與爽快。許多人讚賞本作在打擊感與畫面演出上的進步，尤其是角色大招動畫與場景破壞特效極具魄力，成功呈現原作中的誇張戰鬥規模。不過也有聲音指出部分關卡重複性偏高、AI敵人行動單一，若非《航海王》粉絲可能會覺得遊戲內容稍顯單調。

總結來看，《航海王：海賊無雙4》是成功的粉絲向作品深化與系統進化。不僅保留原作的冒險熱情與角色魅力，更透過自由多變的動作設計與龐大角色陣容，提供一場視覺與操作雙重爽快的戰鬥盛宴。對於《航海王》愛好者而言，幾乎是不可錯過的收藏；對無雙系列玩家而言，則是上手簡單但耐玩度高的優質動作遊戲。尤其在Switch平台上，兼具掌機隨玩與多人遊玩樂趣，在便攜平台上也能完整體驗大場面戰鬥的誠意之作。

One Piece: Pirate Warriors 4 (Japanese: ワンピース 海賊無双4, English: One Piece: Pirate Warriors 4) is a high-energy action musou game developed by Omega Force and published by Bandai Namco. The Nintendo Switch version launched on March 26, 2020, simultaneously with other platforms. As the fourth main installment in the Pirate Warriors series, the game blends the beloved characters and epic storylines of the One Piece anime with the trademark "1 vs 1000" action gameplay of the Dynasty Warriors franchise. It caters heavily to fans of the anime while also remaining accessible to newcomers of musou-style games.

The story mode of Pirate Warriors 4 draws from major arcs of the One Piece anime, covering a wide narrative range—from the early "Alabasta Arc" and "Enies Lobby Arc" to the dramatic "Marineford War Arc", and extending into more recent stories like the "Whole Cake Island Arc" and the "Wano Country Arc". Notably, while much of the plot adheres to the anime's events, the Wano arc features an original ending exclusive to the game, offering players a unique take on the climactic confrontation with Kaido. Each playable character is accompanied by their own story missions and cutscenes, enabling fans to relive the emotional highs and intense battles of the series in interactive form.

Gameplay-wise, Pirate Warriors 4 builds upon the familiar musou formula but introduces key refinements and new systems to enhance depth and dynamism. Players can choose from over 40 characters, each with unique movesets, awakening techniques, and upgradeable skill trees. The core combat structure retains the classic mix of light and heavy attacks for combo chains, but with the addition of aerial combat mechanics and a customizable skill system. Aerial actions allow players to juggle enemies midair, dodge attacks, or unleash special moves, making the battlefield more vertical and mobile. Meanwhile, the new skill system enables equipping various special abilities depending on the character’s type—whether power-based, technical, or aerial—offering flexible playstyles. For example, Luffy can switch between his "Gear Second" and "Gear Fourth" forms mid-battle, while Ace excels at wide-range fire attacks, making each character's combat feel distinctive and visually spectacular.

On the technical side, the PS4 version holds up impressively as well as expected upgrades in resolution and some visual effects compared to Switch or PC. The game maintains stable performance and smooth framerates in both handheld and docked modes. It supports local two-player co-op and online multiplayer for up to four players, allowing friends to team up through the story or tackle various missions together, significantly boosting replayability.

Reception-wise, One Piece: Pirate Warriors 4 received largely positive reviews, especially among One Piece fans. Critics and players alike praised the game as the most polished and content-rich entry in the series. Its vast roster, broad narrative coverage, and refined combat mechanics were frequently highlighted. The impact of special attacks, destructible environments, and cinematic cut-ins during battles were especially lauded for capturing the exaggerated, high-stakes feel of the anime. However, some criticism was directed at the repetitive mission design and the simplistic AI, which may leave non-fans feeling the gameplay becomes monotonous over time.

In conclusion, One Piece: Pirate Warriors 4 is both a refined musou evolution and a love letter to One Piece enthusiasts. It preserves the adventurous spirit and charm of the source material while enhancing the combat with fluid controls and a massive, diverse cast. For longtime fans of the anime, it offers an unmissable chance to dive into iconic battles firsthand. For musou fans, it provides an accessible yet deep action experience. On the Nintendo Switch, the game shines as a portable spectacle, delivering grand-scale combat and cooperative fun that can be enjoyed anywhere.