《音速小子＆全明星賽車：變形》（英文名：Sonic & All-Stars Racing Transformed，日文名：ソニック＆オールスターレーシング TRANSFORMED）是由SEGA發行、Sumo Digital開發的競速遊戲，於2012年在多平台推出，Wii U版本則於同年底作為平台首發作品之一上市。《Sonic & SEGA All-Stars Racing》的續作，延續經典的卡丁車競速元素，並加入「變形」概念，在比賽中可以自由地在陸地、水面與空中三種型態之間切換，使賽道設計與操作深度更勝前作。

雖然並非以劇情為主軸，但在單人模式中設有名為「World Tour」的挑戰旅程，選擇自己喜愛的SEGA角色，在一系列的賽事與挑戰中累積星星以解鎖新角色與路線。這個模式不僅包含傳統競速，還設計時間挑戰、單人賽事等豐富變化，透過不同任務展現角色與車輛性能。每個賽道皆基於SEGA經典遊戲世界設計，例如《音速小子》、《瘋狂計程車》等，充滿粉絲向的細節與懷舊氛圍。

操作方面，融合傳統卡丁車競速的基礎，並加入變形機制。當賽道轉變時，車輛會自動變形成賽艇或飛行器，操作方式也隨之改變。這種三段式競速節奏要求玩家能夠靈活應對不同環境：陸上部分著重甩尾與加速道具掌握，水上則會受到波浪影響，要求穩定掌握方向，而飛行則需考量高度、空中加速與旋轉技巧。每位角色的車輛都有獨特的操控感、速度與變形時的表現，並可透過累積經驗值升級車輛性能，自訂部分屬性以符合個人駕駛風格。

支援Wii U GamePad的第二螢幕功能，可用作地圖導航、即時道具資訊顯示，或支援單人不看電視的遊玩方式。多人遊戲方面，支援本地最多5人同樂（1人使用GamePad，4人使用其他控制器），也支援網路對戰，進行最多10人的線上競速。內建Mii角色參賽功能，以自己的虛擬分身與SEGA明星一同競速，提升互動樂趣。

市場評價方面，獲得普遍正面肯定。IGN給予8.6/10的高分評價，認為在變形機制與賽道設計上遠超出預期，將卡丁車遊戲帶入一個新高度；GameSpot也讚賞其豐富的單人模式與競技性，並指出其操作手感與道具平衡相當成熟。許多評論特別肯定開發團隊對SEGA經典IP的致敬，不僅曲目、背景與角色都充滿情懷，也在遊戲性上做出創新。Wii U版本因支援5人本地遊玩與Mii角色而受到家庭玩家喜愛，但也有部分玩家指出GamePad在操作輔助上的功能不如預期，且線上連線品質偶有不穩現象。

整體而言，《音速小子＆全明星賽車：變形》是兼具速度感、技巧挑戰與粉絲服務的競速佳作，在Wii U上不僅展現主機的多控制器支援優勢，也提供適合家庭與派對聚會的競速體驗。對喜歡卡丁車類型、SEGA角色或富有創意賽道設計的玩家來說，都是值得一試的高完成度作品。

Sonic & All-Stars Racing Transformed (Japanese title: ソニック＆オールスターレーシング TRANSFORMED) is a racing game developed by Sumo Digital and published by SEGA. Released across multiple platforms in 2012, the Wii U version launched later that year as one of the console’s debut titles. A sequel to Sonic & SEGA All-Stars Racing, this entry builds on classic kart-racing gameplay while introducing the core concept of “transformation”—vehicles dynamically switch between car, boat, and aircraft modes mid-race, adding depth to both track design and gameplay mechanics.

Though the game does not focus heavily on narrative, it includes a single-player “World Tour” mode, which acts as a structured series of racing challenges. Players choose their favorite SEGA characters and collect stars by completing various events to unlock new racers and tracks. These challenges go beyond Grand Prix, time attacks, and single race, allowing players to experience each character and vehicle’s capabilities. Tracks are creatively based on classic SEGA franchises such as Sonic the Hedgehog, Crazy Taxi, filled with fan-service references and nostalgic atmosphere.

Gameplay combines traditional kart racing fundamentals with the transformation mechanic. As tracks change environments, vehicles automatically morph into boats or aircraft, with controls adapting accordingly. This three-phase structure requires players to master different terrains: drifting and boost management on land, wave control and steering precision on water, and altitude, air boosts, and aerial maneuvers in flight. Each vehicle has unique handling, speed, and transformation characteristics, which can be enhanced by earning experience points. Players can upgrade stats and fine-tune performance to suit their personal racing style.

The Wii U version utilizes the GamePad’s second screen for features like live maps, item management, or off-TV play. It supports up to five local players—one using the GamePad and four on other controllers—and offers online multiplayer with up to ten participants. Players can also race using their Mii avatars alongside SEGA all-stars, adding a personal and interactive touch.

Critically, the game received generally positive reviews. IGN awarded it an impressive 8.6/10, praising its transformation mechanics and inventive track design, claiming it elevated the kart racing genre. GameSpot also commended the rich single-player content and balanced mechanics, highlighting its refined handling and well-implemented power-up system. Many reviewers celebrated the game’s homage to SEGA’s legacy, noting the music, characters, and visual design as both nostalgic and innovative. The Wii U version gained popularity among family audiences for its five-player local multiplayer and Mii support, though some noted that the GamePad’s in-race functionality felt underutilized and online connectivity was occasionally unstable.

Overall, Sonic & All-Stars Racing Transformed stands out as a high-quality racing title that blends speed, technical skill, and fan-centric design. On Wii U, it showcases the console’s multi-controller features while delivering an accessible yet deep racing experience perfect for families and parties. For fans of kart racers, SEGA franchises, or creative course design, it remains a standout and rewarding title.