《東方彈幕神樂 失落幻想》（Touhou Danmaku Kagura: Phantasia Lost，日文原名：東方ダンマクカグラ ファンタジア・ロスト）是以ZUN創作的東方Project為世界觀基礎，由UnknownX開發、CloverWorks提供支援美術製作的節奏動作遊戲。為手機平台的節奏遊戲《東方彈幕神樂》的家用主機進化版本，2024年正式登陸Nintendo Switch與PC平台，標誌著該系列首次全面移植至非行動裝置，並加入全新劇情與完全單機內容。

故事發生在一個「幻想鄉」已被摧毀、世界支離破碎的時空中。主角是一名神秘旅人，與自稱來自神樂殿的少女「伊吹慧夢」同行，踏上重建幻想鄉的旅程。劇情以穿越各種「記憶碎片」為主軸，這些碎片實際上就是以東方系列角色與背景為靈感製作的音樂關卡。透過演奏這些關卡，不斷喚醒過去角色的記憶，逐步拼湊出幻想鄉崩壞的真相。

相較於原作手機版以活動與日常為主的輕敘事，加入更具結構性的劇情線，配合細膩的美術插圖與語音演出，使得遊戲除音樂性以外，也提供一種角色驅動的冒險感。將與靈夢、魔理沙等熟悉角色逐一重逢，並見證她們對「幻想鄉」的情感與信念。

核心玩法仍是節奏遊戲，但融合「彈幕」美學，使其在視覺與節奏設計上呈現出濃厚的東方風格。需根據音樂節拍，在畫面上下落的「彈幕音符」上進行點擊或滑動操作。支援多種控制方式，包括觸控與按鈕操作，也根據不同平台進行優化，Switch版本即可以Joy-Con進行舒適的按鍵輸入，提供穩定的節奏感。

每首曲目都搭配專屬的視覺風格與背景特效，模擬出原作中絢爛又壓迫感十足的彈幕場面。內建大量東方Project改編與二創音樂，曲目數超過50首以上，包括大家熟知的〈Bad Apple!!〉、〈U.N.オーエンは彼女なのか？〉、〈ナイト・オブ・ナイツ〉等知名同人神曲，也包含許多來自Alstroemeria Records、ZUN本人原曲與東方圈著名創作者的合作曲目。

不同難度設計讓新手與資深玩家都能找到適合自己的節奏挑戰，並搭配角色收集與「隊伍編成」系統，使每場演奏能透過不同角色技能影響得分或特效，雖然這部分相比手機原作有所簡化，但仍保留策略成分。

上市後普遍獲得東方系列粉絲的肯定。評論主要集中在兩大亮點：第一是視覺與音樂品質極高，CloverWorks所繪製的過場動畫與人物立繪在同類型作品中屬於頂尖水準；第二是豐富的曲目陣容與極具風格的節奏編排，即便不熟悉東方Project的玩家也能單純以節奏遊戲角度享受。

在日本地區與國際東方圈的反應普遍熱烈，許多原本是手機版《彈幕神樂》的粉絲認為Switch版不但提供更穩定的遊玩體驗，也彌補行動版停服所帶來的遺憾。Steam與Switch上的使用者評價多為正面，特別提到該作在單機模式下也提供足夠的可玩性與收藏動機。

然而，也有少數評論指出內容量相對有限，除主線與音樂模式外缺乏延伸玩法，角色育成與收集系統也被大幅簡化，對於原本期待豐富養成要素的玩家而言可能略感單薄。此外，本作目前沒有中文語言支援，對於非日語或英語玩家來說可能造成敘事理解上的障礙。

總體來說，《東方彈幕神樂 失落幻想》是視覺與聽覺兼備、專為東方Project愛好者量身打造的節奏遊戲，也適合想探索彈幕美學與同人音樂魅力的玩家。既是一封獻給東方粉絲的情書，也是將「幻想鄉」透過音樂重建的詩意旅程。

Touhou Danmaku Kagura: Phantasia Lost (Japanese title: 東方ダンマクカグラ ファンタジア・ロスト) is a rhythm-action game developed by UnknownX, with artistic support from animation studio CloverWorks. Based on the world of the Touhou Project, originally created by ZUN, this title serves as a home console evolution of the mobile rhythm game Touhou Danmaku Kagura. Officially released in 2024 for Nintendo Switch and PC, it marks the series’ first full migration from mobile to non-portable platforms, introducing new story content and a completely offline experience.

The game’s story is set in a shattered timeline where the mystical land of Gensokyo has already been destroyed. The protagonist, a mysterious traveler, journeys alongside a self-proclaimed maiden of the "Kagura Hall" named Ibuki Keimu. Together, they set out on a mission to restore Gensokyo. The narrative revolves around traveling through “memory fragments,” which are actually musical stages inspired by Touhou characters and lore. By performing these songs, players awaken the memories of past characters and gradually uncover the truth behind the collapse of Gensokyo.

Compared to the light and event-driven storytelling of the mobile original, Phantasia Lost presents a more structured narrative. Enhanced by detailed illustrations and voiced cutscenes, the game delivers an emotionally driven adventure that complements its rhythm gameplay. Players will reunite with familiar characters like Reimu Hakurei and Marisa Kirisame, each revealing their personal bonds and beliefs about the fallen Gensokyo.

At its core, the game remains a rhythm experience, but with a distinctive danmaku (bullet hell) aesthetic that defines both its visual style and gameplay mechanics. Players must tap or slide in sync with musical notes that fall like bullets from the top of the screen, creating a signature Touhou-inspired rhythm-battle effect. The game supports multiple input methods, including touchscreen and button controls, with the Switch version optimized for comfortable Joy-Con input, offering a smooth and responsive rhythm feel.

Each song is accompanied by unique visual effects and themed backgrounds that recreate the dazzling and intense atmosphere of Touhou’s bullet hell heritage. The game includes over 50 tracks, featuring iconic fan-favorite songs such as “Bad Apple!!,” “U.N. Owen Was Her?”, and “Night of Nights,” as well as original compositions from ZUN himself and notable Touhou circles like Alstroemeria Records. This vast and carefully curated soundtrack enhances both immersion and replayability.

Multiple difficulty levels ensure accessibility for rhythm game newcomers while offering a challenge for veteran players. The game also features a simplified character collection and team formation system, where players can assemble squads whose unique abilities affect score bonuses and visual effects. Although streamlined compared to the mobile version, this adds a layer of strategy to the gameplay.

Following its release, Phantasia Lost received widespread praise from Touhou fans. Two aspects drew the most acclaim: the high production quality of its visuals and music—especially the character illustrations and animations created by CloverWorks—and the strong, stylized rhythm design. Even players unfamiliar with the Touhou Project can enjoy the game purely as a high-quality rhythm experience.

The game was met with enthusiasm both in Japan and among the global Touhou fan community. Many players who enjoyed the original mobile version appreciated the Switch port's improved performance and the ability to preserve their favorite game after the mobile servers shut down. User reviews on both Steam and Switch platforms were largely positive, with many highlighting the title’s single-player mode as being robust and collectible.

However, some criticisms were raised. A few players noted that aside from the main story and rhythm mode, the game lacked additional content. The character growth and collection systems were significantly simplified, which may disappoint players looking for deep RPG-like progression. Furthermore, the game currently does not support Chinese localization, which could hinder narrative comprehension for players who are not fluent in Japanese or English.

In summary, Touhou Danmaku Kagura: Phantasia Lost is a rhythm game that excels in both audio and visual presentation, tailored especially for fans of the Touhou Project. It also serves as a great entry point for those curious about bullet hell aesthetics or doujin music. More than just a game, it is a heartfelt tribute to Touhou fans and a poetic journey to rebuild Gensokyo through music.