《音速小子與暗黑騎士》（英文名：Sonic and the Black Knight，日文原名：ソニックと暗黒の騎士）是由SEGA旗下的Sonic Team開發，於2009年在Wii平台推出的動作冒險遊戲。屬於「音速小子」系列中的外傳作品，同時也是「故事書系列（Storybook Series）」的第二部，延續前作《音速小子與秘密戒指》將經典音速世界結合文學題材的創意設定。改編自亞瑟王與圓桌騎士的傳說，加入奇幻與劍與魔法的元素，體驗不同以往的「劍術音速冒險」。

劇情設定在一個幻想中的中世王國，音速小子Sonic被神祕魔法召喚至亞瑟王傳說世界，這個世界正面臨騎士王亞瑟（King Arthur）墮落成為暗黑騎士、帶領不死軍團支配土地的危機。為阻止這場災難，神秘少女梅莉娜（Merlina）請求Sonic協助，並將能說話的聖劍「卡里伯恩（Caliburn）」交給他。Sonic必須成為劍之騎士，踏上尋找其他圓桌騎士（實際上是Sonic世界的角色，如Knuckles、Shadow與Blaze擔任不同騎士）並擊敗暗黑亞瑟的旅程。故事融合原本的速度感與傳統英倫騎士道，並探討勇氣、榮譽與自由意志等主題，在青少年向的基調下亦不乏哲理性。

操作方面，為第三人稱動作遊戲，基礎操作保留一貫的「高速奔跑」風格，但在此基礎上加入大量的劍擊戰鬥元素。需使用Wii遙控器揮動來進行斬擊，模擬揮劍動作，並可在奔跑中切換攻擊與防禦節奏。角色自動向前移動的設計仍然保留（與前作《秘密戒指》類似），但加入更多分岔路線、QTE事件與跳躍平台關卡。除Sonic之外，還可操作其他圓桌騎士角色，每人擁有不同的武器與戰鬥風格，例如Knuckles的雙拳攻擊或Shadow的暗黑劍技。也包含RPG要素，如劍的升級、收集任務與角色之間的聲望系統，可解鎖額外劇情與挑戰。

視覺風格相當有特色，以中世幻想為主軸打造的關卡場景如森林、火山、城堡與湖泊等皆具電影感，角色設計則保留原本的卡通感與騎士造型融合，增添新鮮視覺趣味。配樂則以管弦與搖滾混合為主，特別是Boss戰與重要劇情演出使用重節奏曲風，帶出氣勢與幻想氛圍。語音配音方面維持系列一貫水準，全語音演出強化角色塑造與沉浸感。

市場評價方面，反應相當兩極。部分玩家與評論讚賞其世界觀創意與角色造型轉化，特別是以Sonic角色重新演繹亞瑟傳說的設定，帶來有趣的新鮮感。劇情也獲得好評，認為比起其他音速遊戲更具敘事深度與角色成長描寫。然而在操作體驗上，則出現較多批評。劍擊操作因Wii遙控器動作感應準確度問題，時常出現判定不清、連段不穩的狀況，導致戰鬥節奏容易混亂，尤其在高難度關卡下影響遊戲流暢度。此外，部分關卡設計與任務目標顯得重複性高、節奏斷裂，讓不少玩家感到沮喪。

總體而言，這是風格大膽、結合傳統文學題材與知名角色的跨界實驗。以故事與角色魅力為主軸，補足音速系列長期以來缺乏的敘事感，並嘗試以Wii體感創造不同以往的戰鬥體驗。雖然在操作技術上尚有缺陷，但對喜愛Sonic角色或對亞瑟王題材感興趣的玩家而言，依然是值得探索的中世奇幻旅程。

Sonic and the Black Knight (Japanese title: ソニックと暗黒の騎士) is an action-adventure game developed by SEGA’s Sonic Team, released for the Wii platform in 2009. It is a spin-off entry in the Sonic the Hedgehog series and the second installment in the "Storybook Series," following Sonic and the Secret Rings, which creatively blended the classic Sonic universe with famous literary themes. This time, the game adapts the legend of King Arthur and the Knights of the Round Table, adding elements of fantasy, swordplay, and magic to deliver a different kind of "sword-fighting Sonic adventure."

The story is set in a fictional medieval kingdom where Sonic is summoned by mysterious magic into the world of Arthurian legend. This world is facing a grave threat: King Arthur has fallen and become the Black Knight, leading an undead army to conquer the land. To stop this disaster, a mysterious girl named Merlina seeks Sonic’s help and gives him the talking sword, Caliburn. Sonic must become the "Knight of the Sword," embark on a journey to find the other Knights of the Round Table (who are actually familiar Sonic characters like Knuckles, Shadow, and Blaze), and defeat the corrupted King Arthur. The story blends Sonic’s signature sense of speed with traditional English chivalry, while also exploring themes of courage, honor, and free will. Despite its youthful tone, the narrative contains surprisingly philosophical elements.

In terms of gameplay, Sonic and the Black Knight is a third-person action game. It retains the series’ iconic "high-speed running" as its base but layers in heavy sword-fighting mechanics. Players use the Wii Remote to swing their sword, simulating real swordplay movements, and must alternate between attacking and defending while running. The auto-forward movement mechanic from Secret Rings is still present but is enhanced with more branching paths, quick-time events, and platforming sections. Besides Sonic, players can also control other Knights of the Round Table, each with unique weapons and combat styles—such as Knuckles' powerful fist attacks and Shadow’s dark sword techniques. The game also incorporates RPG elements, including sword upgrades, collectible quests, and a reputation system between characters, which unlock additional stories and challenges.

Visually, the game has a distinct style, building cinematic environments like forests, volcanoes, castles, and lakes, all centered around a medieval fantasy theme. Character designs maintain Sonic’s original cartoonish charm while merging it with knightly armor aesthetics, offering a refreshing visual twist. The soundtrack mixes orchestral and rock elements, with boss battles and major story moments using intense, rhythm-driven tracks to heighten the epic and fantastical atmosphere. Voice acting is fully featured, continuing the series’ tradition and enhancing character development and immersion.

Reception was quite mixed. Some players and critics praised the creative world-building and the clever reimagining of Sonic characters in Arthurian roles, finding the setting refreshingly inventive. The story also received positive comments for having greater narrative depth and character growth compared to other Sonic titles. However, the gameplay experience drew more criticism. Sword-swinging actions often suffered from inconsistent Wii Remote motion detection, leading to unclear hit registration and unstable combo sequences, which disrupted the battle flow, particularly in more difficult stages. Moreover, some levels and mission objectives were seen as repetitive and rhythm-breaking, frustrating many players.

Overall, Sonic and the Black Knight stands as a bold and experimental crossover of classic literature themes with iconic characters. It focuses on storytelling and character charm to fill the narrative gap often found in Sonic games and attempts to create a unique combat experience through Wii motion controls. While technical flaws hold it back, the game remains a worthwhile and fascinating medieval fantasy journey, especially for Sonic fans and those intrigued by Arthurian legend.