《瑪利歐＆索尼克AT倫敦奧運》（マリオ＆ソニックATロンドンオリンピック/Mario & Sonic at the London 2012 Olympic Games）是由SEGA開發、任天堂發行，於2012年在3DS平台推出的跨界運動競技遊戲。是瑪利歐與索尼克兩大經典角色系列合作的第三部奧運主題作品，也是首款於掌機平台推出的版本，相較Wii的家用主機版本，加入便攜式遊玩與觸控操作等新要素，並在內容與關卡設計上有著針對掌機玩家習慣的調整。

劇情模式名為「奧運模式（Olympic Mode）」，採用輕鬆幽默的風格展開。在這個模式中，倫敦正舉辦熱鬧非凡的奧林匹克運動會，但某一天，奧運聖火突然熄滅，現場陷入一片混亂。原來是反派角色蛋頭博士（Dr. Eggman）與庫巴（Bowser）聯手，企圖破壞整場盛會。為恢復奧運的榮光，瑪利歐與索尼克率領兩個世界的夥伴們展開調查與挑戰，透過參與各種運動項目來找回失去的聖火碎片，最終揭露反派陰謀並重新點燃奧運精神。劇情雖然不複雜，卻充滿典型的任天堂與SEGA式幽默，搭配可愛對話與角色互動，為整體運動比賽增添一絲冒險與輕鬆氛圍。

在操作方面，3DS版本特別強調多樣的操作形式。需根據不同的比賽項目使用觸控筆、陀螺儀感應（傾斜主機）、按鍵組合甚至吹氣麥克風等方式進行互動。這些設計讓各種項目都擁有獨特操作風格，例如在划船項目中，需節奏性地滑動觸控筆；在射箭比賽中則要用觸控瞄準、按鍵蓄力；而在游泳項目則需左右交替快速觸碰螢幕。這些操作手法的變化不僅讓遊戲節奏更為活潑，也使玩家在掌機上能充分體驗奧運競技的身歷其境感。

關卡與內容方面，3DS版本包含超過50種奧運項目與「夢幻比賽（Dream Events）」。奧運項目涵蓋田徑、游泳、體操、划船、擊劍、桌球等傳統比賽，重現現實倫敦奧運會中的正式賽事；而夢幻比賽則是結合瑪利歐與索尼克系列特色的虛構賽事，像是在蘑菇王國或化學工廠裡進行的空中競速、魔法競技等。這些關卡將角色特性與幻想元素融入運動中，充滿想像力與娛樂性。此外，還有角色集換卡片、獎盃收藏、挑戰模式等延伸玩法，為單人遊戲增加重玩價值。

值得一提的是，3DS版也設有本地連線與多人對戰功能，最多可支援四人同時遊玩，無論是比賽速度、技巧還是爆笑亂鬥，都適合朋友間一同娛樂。對於喜歡收集的玩家，還能透過StreetPass系統與其他玩家交換卡片與紀錄，增加互動與競爭性。

就市場評價而言，在發售後獲得褒貶不一的反應。正面評價多集中在遊戲種類豐富、操作多元、角色人氣高、夢幻比賽創意十足等方面，尤其對於年輕玩家與家庭玩家來說，可說是掌機上的派對娛樂首選。許多玩家也欣賞其將真實運動與幻想冒險融合的風格，讓傳統體育遊戲多更多想像空間。

然而，部分評論指出操作方式雖然多變，但有些項目過度依賴gimmick式觸控與體感，導致反應不夠精準或變得單調。也有聲音批評劇情模式雖具趣味，但流程過長、節奏略顯拖沓，且部分項目在重玩性上稍弱。相較於主機版本的畫面與聲光效果，3DS版在視覺張力與表現力上也略顯保守。

總結而言，3DS版本的《瑪利歐＆索尼克AT倫敦奧運》是充滿娛樂性與創意的跨界運動遊戲，將奧運競技與兩大遊戲品牌的角色魅力巧妙融合。雖然並非完全無瑕，但其輕鬆的劇情模式、豐富的項目設計與適合掌機操作的系統，使其成為3DS平台上值得一試的派對型運動遊戲，尤其適合喜歡任天堂與SEGA角色、或是偏好輕鬆競技的玩家族群。

Mario & Sonic at the London 2012 Olympic Games (Japanese title: マリオ＆ソニックATロンドンオリンピック) is a crossover sports game developed by SEGA and published by Nintendo, released in 2012 for the Nintendo 3DS. It marks the third Olympic-themed collaboration between the Mario and Sonic franchises and is the first entry in the series to be released on a handheld console. Compared to the Wii version, this handheld edition introduces portable gameplay and touchscreen-based controls, with various adjustments in content and stage design tailored to suit the habits of handheld gamers.

The game’s story mode, known as “Olympic Mode,” unfolds in a light-hearted and humorous tone. In this mode, the city of London is hosting a grand and festive Olympic Games, but the celebration is thrown into chaos when the Olympic flame is suddenly extinguished. It is soon revealed that Dr. Eggman and Bowser have teamed up in a plot to disrupt the entire event. In response, Mario and Sonic rally their allies from both worlds and embark on an adventure to investigate the cause, recover the lost flame fragments through a series of sporting events, and ultimately foil the villains' plan to reignite the Olympic spirit. While the narrative itself is simple, it’s packed with classic Nintendo and SEGA-style humor, charming dialogue, and playful character interactions, adding a layer of fun and adventure to the overall sports experience.

In terms of controls, the 3DS version emphasizes a wide variety of input methods. Depending on the specific event, players may need to use the stylus, tilt the console with the gyroscope, press button combinations, or even blow into the microphone. These mechanisms create unique gameplay styles for each event—for example, rowing requires rhythmic stylus swipes, archery uses touch-based aiming combined with button-powered tension, and swimming involves rapidly alternating taps on the screen. This variety of control schemes keeps the pacing dynamic and helps players feel more immersed in the Olympic competition on a handheld device.

Content-wise, the 3DS version includes over 50 Olympic events and a set of imaginative “Dream Events.” The standard Olympic events include classic disciplines like track and field, swimming, gymnastics, rowing, fencing, and table tennis, faithfully recreating official events from the real-life London 2012 Games. In contrast, the Dream Events feature fictional, fantastical competitions inspired by the worlds of Mario and Sonic—such as airborne races through the Mushroom Kingdom or magical duels in chemical plants. These imaginative stages blend character traits with fantastical elements, offering players a creative and entertaining twist on traditional sports. Additionally, features such as collectible character cards, trophy galleries, and challenge modes enhance replay value for solo players.

The game also supports local multiplayer, allowing up to four players to compete simultaneously via wireless connection. Whether racing for speed, competing in skill-based events, or engaging in chaotic Dream Event battles, it offers a great party experience for friends. For collectors and completionists, the StreetPass system enables card and record exchanges with nearby players, adding an extra layer of interactivity and competitiveness.

Upon release, the game received mixed reviews from the market. On the positive side, it was praised for its wide variety of events, creative controls, beloved character roster, and the whimsical Dream Events. For younger players and families, it was considered one of the best party-style sports games available on a handheld system. Many players appreciated how the game combined real-world sports with elements of fantasy and adventure, giving a refreshing twist to the traditional sports genre.

However, some critiques pointed out that while the control schemes were diverse, a few events relied too heavily on gimmicky touch or motion controls, which could sometimes feel imprecise or repetitive. Others noted that, although the story mode was charming, it occasionally dragged on and lacked pacing, with some events offering limited replay value. Compared to the home console version, the graphics and visual effects on the 3DS felt somewhat modest and restrained.

In conclusion, the 3DS version of Mario & Sonic at the London 2012 Olympic Games is a fun and creative crossover sports title that cleverly combines the Olympic theme with the charm of two of gaming’s most iconic franchises. Though not without its flaws, its accessible story mode, rich variety of events, and handheld-friendly mechanics make it a worthwhile experience on the 3DS—especially for fans of Nintendo and SEGA characters, or players looking for a lighthearted sports game on the go.