You Are The Historian of Old Tokyo.

In Mysteries of Old Tokyo, you’re the brand new investigator for the Tokyo branch of the secretive Rare Items Acquisitions Ltd.

Mysteries of Old Tokyo  is inspired by the CD-ROM "multimedia experiences" of the 1990s like Encarta '96 and Cosmology of Kyoto, as well as modern detective games like The Roottrees are Dead and the Golden Idol series.

Review the evidence, answer the questions, and help complete an unrivalled, meticulously researched database of Tokyo.

You’re a historian now! 30 hand-crafted puzzles explore the fascinating history of the Imperial Capital. Each week, you'll explore three new locations based on a 1930s postcard:

• Take a photo to show the present day view at the very same spot.

• Collect evidence linked to the site: books, magazines, maps, paintings, archive photos, and more.

• Use analysis and synthesis to build the complete picture from multiple sources, just like a real historian.

• Extract words  to correct the historical record in "fill-in-the-gap"-style gameplay.

• Analyse  your photos to compare the changes between the 1930s to the 2020s.

You’ll fill in the gaps for each postcard and help your mysterious employer create a detailed database of Tokyo’s history, all based on real historical sources.

Meet a cast of wandering spirits, identify the truth in their lies, and unlock their stories.

You won’t be alone as you explore Tokyo. A supernatural dam has burst, spilling confused ghosts from the Iron Age to the 1980s across the city. As they tell their stories, not everything they say will add up.

• Encounter  spirits of the "Edokko" ("children of Tokyo") at new and old locations as you explore the city.

• Build up their story bit-by-bit in the Spirit Report.

• Procedurally-generated narratives, based on a database of hundreds of locations, ensure a fresh challenge every time you play.

• Use the Encyclopedia  and your personal experience of Tokyo to identify the errors and lies.

• Chigau! I object! J'accuse! Highlight the inconsistencies and catch them out to help them clear up their memories.

• Each time you submit a Spirit Report , you'll build up trust with the spirit and unlock more of their backstory, based on the real lives of the Edokko: from flirty courtesan Kasuga-dono to bubble-bound salaryman Yoshida-san, and many more.

As a roving researcher, take photographs and collect evidence detailing the real history of Tokyo on a sumptuously detailed map.

You're not just a desk jockey. Each week, with PDA and digital camera in hand, you’ll set out from your office to visit three new locations.

• Go by foot or by train from your home base in Marunouchi to view each postcard in its real-world geographical context across four maps: Central Tokyo, Downtown Marunouchi, Tama River and Haneda.

• Revisit old haunts based on paranormal analysis to discover new stories for the Spirit Report.

• Plot a route to some of the most famous Tokyo landmarks:

• Manage your stamina through careful navigation, or crash out in a hotel if it all gets too much.

Compare 1930s images with real photos taken in 2025 at the same locations. Find what’s new – and what’s old – in this mercurial, ever-changing city.

• Use the Similarity Finder to precisely line up present-day photographs with the original postcards.

• With the Time Loupe in Direct Mode , compare past and present and identify common features.

• In Parallels Mode , tease out the tiniest similarities in views that have changed almost completely since 1935.

• And in the Treasure Browser , unlock fascinating low-poly 3D artefacts, each telling their own story of the Imperial Capital.

Explore an authentic recreation of Tokyo, past and present.

For lovers of Tokyo, this might just be the most authentic interactive recreation ever made.

• Painstaking research reveals the history behind a set of antique 1930s postcards, discovered at a flea market in Shibuya and scanned in high quality.

• Each postcard is complemented by the original description, human-translated from Japanese for the first time. Illustrations, modern-day photographs, and an author's commentary provide the full picture.

• Ride the rails on a meticulous recreation of 18 real-world train lines and hundreds of stations, from Akabane to Zoshigaya.

• Go back in time  with a complex four-dimensional map of Tokyo's transit, covering every year from 1872 right up to the present day.

• Hundreds more Tokyo locations in the landmark   database , visited by mysterious spirits, from the Imperial Hotel to the Tokyo Skytree.

• A huge encyclopedia  based on extensive research, telling the whole story of Tokyo from prehistory, through the Edo period, to the 80s bubble and beyond.

Defeat the supernatural threat and save Tokyo in a story spanning 10 chapters.

Ancient fortresses crumble. Long-forgotten spirits flood the city. A powerful supernatural force threatens to upend the everyday lives of Tokyo’s 14 million residents. Each week, as you unlock more postcards, you’ll uncover more of the backstory and ultimately save the city.