《瑪利歐與路易吉RPG 3 DX》（Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey）是由AlphaDream開發、任天堂發行的3DS重製版RPG，於2018年（日本）和2019年（全球其他地區）推出。是2009年NDS原版《瑪利歐與路易吉RPG 3!!!》（Mario & Luigi: Bowser's Inside Story）的強化版，不僅保留原作的核心魅力與創意玩法，更針對畫面、操作與配樂進行翻新，同時加入全新支線模式《庫巴Jr.傳說》（Bowser Jr.'s Journey），拓展世界觀與角色描寫，是系列最具代表性的作品之一，也被許多玩家認為是該系列的巔峰。

主線劇情圍繞庫巴誤食「布羅洛菌」（Blorbs）疫情中捲入的陰謀。蘑菇王國爆發神秘病症，居民變得像氣球般膨脹。為了解決這場危機，瑪利歐與路易吉前往碧姬城堡，但卻在混亂中被庫巴吸入體內。原來這一切都是反派「拉柯比茲」（Fawful）精心設計的陰謀，他設法操控庫巴並計畫奪取整個王國。因此，玩家將經歷兩條交錯的冒險線索：外部世界由庫巴行動，他逐漸奪回自己的身體控制權並探索各地；而瑪利歐與路易吉則身處庫巴體內的微觀世界，進行細胞層級的冒險，幫助庫巴恢復力量，並在生理層面解決種種異常。這種「體內冒險」與「外部探險」交替進行的設計，不僅獨特而創新，也讓故事節奏富有變化。庫巴雖然平時是敵人，卻在此作中成為可操作角色，他的傲慢與笨拙形成幽默反差，也讓他成為本作最具魅力的亮點之一。

操作上，依舊採用回合制戰鬥系統，融合即時反應與節奏輸入，讓每次攻防都需要玩家的技巧與時機判斷。瑪利歐與路易吉透過雙鍵操作（A與B鍵分別控制），進行配合攻擊與跳躍閃避；庫巴則以更具力量感的戰鬥風格為主，包括火焰吐息與拳擊。還有名為「巨型庫巴對戰」的特殊戰鬥場面，透過觸控筆橫持操作，操作巨大化的庫巴與巨大敵人進行激烈對決，增加遊戲的多樣性與動感。

解謎與關卡設計則以2D橫向探索為主，庫巴與兄弟倆在不同地圖中穿梭解謎。庫巴可用吸氣、衝撞等技能開啟新路，瑪利歐與路易吉則須搭配跳躍、鑽地、旋轉等組合動作通過障礙。庫巴體內本身也像是一座迷宮，包含肺部、胃、神經系統等「關卡」，每一處都設有特色機制與敵人，具高度創意與視覺巧思，讓玩家從「內部」支援庫巴的成長與進化。

全新加入的《庫巴Jr.傳說》則是一段支線戰略RPG故事，描述庫巴Jr.在父親昏迷期間，試圖主導王國軍隊、維持庫巴軍的統治地位。與主線玩法不同，這個模式主打小隊編成與自動戰鬥，需根據敵我兵種相剋安排兵力，並在戰鬥中觸發技能，提升勝率。雖然操作簡化，但劇情補足庫巴家族與手下角色的個性，讓整體世界觀更為豐富完整。在視覺與音樂上，全面升級圖像品質，以3DS標準重繪角色與場景，表現更細膩、生動，角色動作流暢度也顯著提升。配樂方面則由系列作曲家下村陽子重新錄製與編曲，不僅保留原作節奏強烈、富幽默感的旋律，也增添新曲，讓舊玩家倍感懷舊，新玩家則沉浸其中。

市場評價方面，獲得多數正面反響，評論普遍讚賞其高完成度與創新概念的完美重製，尤其對庫巴的操作感、雙線敘事與互動戰鬥系統給予極高評價。不過，也有部分批評認為本作推出時間過晚（接近3DS末期）導致銷量未達預期，且原作版本本身已極為優秀，使得本次重製缺乏驚喜。然而對於系列愛好者與尚未體驗過原作的新玩家而言，本作依然是內容豐富、幽默十足、系統完善的RPG旅程。

總體來說，這是將創意玩法、劇情節奏與角色魅力完美融合的代表作。它不僅重現原作的經典光芒，更透過視覺重製與新內容擴展，成為3DS平台上最值得嘗試的角色扮演作品之一，也是瑪利歐系列中極具個性與敘事深度的一頁。

Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey is a remastered RPG developed by AlphaDream and published by Nintendo for the Nintendo 3DS. Released in 2018 in Japan and in 2019 for other regions, it is an enhanced version of the original 2009 Nintendo DS game Mario & Luigi: Bowser's Inside Story. This remake not only preserves the original’s core charm and inventive gameplay but also features updated visuals, improved controls, and remastered music. Additionally, it introduces an all-new side mode called Bowser Jr.'s Journey, which expands the worldbuilding and character development. It is widely regarded as one of the most representative entries in the Mario & Luigi series and often considered the pinnacle of the franchise by fans.

The main story revolves around a mysterious outbreak in the Mushroom Kingdom, known as the "Blorbs" disease, which causes residents to swell up like balloons. Bowser accidentally swallows a strange mushroom and ends up inhaling Mario, Luigi, and Princess Peach during a confrontation at Peach’s Castle. This bizarre chain of events turns out to be part of an elaborate plot orchestrated by the recurring villain Fawful, who aims to control Bowser and take over the kingdom.

The player follows two interwoven narrative threads: Bowser’s adventure in the outside world, where he gradually regains control of his body and explores various regions, and Mario and Luigi’s journey inside Bowser’s body, where they undertake microscopic adventures to support his recovery. This dual-layered storytelling structure—alternating between internal and external exploration—is both unique and innovative, lending the game a dynamic and ever-changing rhythm. While Bowser is traditionally a villain, here he becomes a playable protagonist whose arrogant and bumbling personality brings unexpected humor and charm, making him one of the game’s standout elements.

The gameplay retains the turn-based battle system but blends it with real-time action inputs, requiring players to master timing and coordination for both offense and defense. Mario and Luigi are controlled individually with the A and B buttons, enabling synchronized attacks and dodges. Bowser, on the other hand, features a more brute-force combat style involving punches and fire breath. The game also includes special "Giant Bowser Battles," which make use of the 3DS’s touchscreen and require players to rotate the console to command a giant-sized Bowser in epic boss fights—adding spectacle and variety to the gameplay.

Exploration and puzzle-solving are primarily presented in 2D side-scrolling environments. Bowser and the brothers navigate different maps, using unique abilities to overcome obstacles. Bowser can inhale objects, charge through barriers, and access new areas, while Mario and Luigi must combine skills like jumping, spinning, and burrowing to solve puzzles. Bowser’s internal world is creatively designed as a complex maze-like setting, complete with organs like the lungs, stomach, and nervous system—each offering its own mechanics and enemies. These areas showcase imaginative level design and visual flair, allowing players to support Bowser’s growth "from the inside."

The newly added Bowser Jr.'s Journey is a strategic side story set during Bowser’s coma. It follows Bowser Jr. as he attempts to lead the Koopa Troop and assert dominance in his father’s absence. Unlike the main RPG, this mode centers on squad-based formation and semi-automated battles, where players must carefully manage troop types and exploit enemy weaknesses while triggering special moves during fights. Though simpler in execution, this mode expands the series’ lore and brings more depth to Bowser’s minions and family dynamics.

Visually, the game receives a complete overhaul, with characters and environments redrawn to match the 3DS’s capabilities. Animations are smoother and more expressive, bringing more life to interactions and battles. The soundtrack, re-recorded and rearranged by veteran composer Yoko Shimomura, retains the quirky and energetic melodies of the original while introducing new tracks that appeal to both nostalgic fans and newcomers.

Critically, the game received mostly positive reviews. It was praised for its high production value, faithful yet improved design, and the excellent integration of dual-story mechanics and interactive combat. Many outlets highlighted Bowser’s expanded role and gameplay as a key strength. However, some critics noted that the release came late in the 3DS’s life cycle, which affected its commercial success. Additionally, since the original game was already highly acclaimed, the remake offered few surprises for returning players. Nevertheless, for series enthusiasts and those who never played the DS version, this title remains a content-rich, charming, and well-crafted RPG experience.

In summary, Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey is a shining example of how to blend creative gameplay, engaging storytelling, and character-driven humor. It faithfully revitalizes a beloved classic while enriching it with modern visuals and fresh content. Whether you're a newcomer to the franchise or a longtime fan, this entry offers one of the most memorable and personality-filled RPG journeys on the 3DS platform.