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Uncover the silenced voices of Unit 731 victims. Decipher clues hidden across forgotten sites to expose the atrocities and recover lost testimonies before they vanish forever.
📱 1 to 10 phones · 1 team per phone · Independent codes
In the frozen shadows of 1930s Harbin, Japan's secret Unit 731 conducted unimaginable horrors in Pingfang's labs—vivisections, plague experiments, and mass executions shrouded in secrecy
You are a special investigator for the International Historical Commission, tasked with documenting the hidden narratives of Harbin in the aftermath of the Second Sino-Japanese War, 1946.
Your mission begins in
Delve into the forgotten layers of Harbin, where the echoes of Russian and Japanese empires still resonate through the streets of this border city in Hokkaido.
Your investigation begins at the Pingfang Peace Memorial, a site constructed in 1982 to commemorate the victims of Unit 731. This area, spanning 150,000 m², includes underground laboratory ruins discovered in 1984. It was here that over 3,000 Chinese, Korean, and Soviet prisoners were used as human guinea pigs in deadly experiments between 1936 and 1945. Open to the public since 1985, this museum documents the war crimes of the Japanese Army during the Second Sino-Japanese War, laying the groundwork for your exploration of the Unit 731 crime museum, an essential testament to Harbin's past.
Continue your immersion at the Museum of Evidence of War Crimes by Japanese Army Unit 731, established in 1985 on the actual site of the former Unit 731 in Pingfang District, Harbin. Led by Japanese military surgeon Shiro Ishii from 1936 to 1945, this complex initially covered 6 km² with over 150 buildings before its destruction in 1945. Exhibits include original artifacts like pathogen vials and photos of experiments on an estimated 250,000 victims, offering a stark perspective on this dark period in Hokkaido's history.
Your journey then takes you to Harbin Railway Station, built in 1903 by the Russians on the Sino-Russian (CER) line and rebuilt in 1906 after a fire. This main building, in Russian Byzantine style, covering 4,450 m², could accommodate 30,000 passengers daily. It was a crucial arrival point for Russian settlers fleeing the 1917 Revolution, which boosted Harbin's population to 200,000 by 1920. The station, renovated in 2010 for the city's 110th anniversary, symbolizes the lasting Russian influence on Harbin's architecture and demography, a UNESCO City of Urban Design 2016.
Exploring Zhaolin Park, created in 1902 under Russian influence as a public garden in Harbin's central Daoli district, you discover a different facet of local history. Spanning 9.8 hectares, it houses a statue of Lenin erected in 1955 and a music kiosk from 1906. This park was a site of historical gatherings during the Chinese Civil War (1946-1949). Renovated in 1997, it hosts local ice festivals every winter, showing Harbin's ability to transform its historical spaces into places of celebration and memory, linked to its Russian-Chinese historical heritage.
Your tour concludes in front of the Saint Sophia Cathedral in Harbin, built between 1907 and 1911 by the Russian Orthodox Church. The largest Orthodox church in China, with 721 m² of floor area and a central dome 53.35 meters high, it was closed in 1949 and used as a warehouse until 1997. Restored in 1997, it is now the Harbin Museum of Architecture and Art, illustrating Russian Orthodox architecture and the city's resilience. Your exploration of Harbin, a UNESCO City of Urban Design 2016, will have allowed you to retrace a complex past, from war crimes to cultural legacies, and understand how this Hokkaido city has preserved the echoes of the forgotten.
Explore the city on foot solving puzzles based on real historical facts. No locked room — the city is your playground.
No app to download. Play directly from your browser. Guided step by step, at your own pace.
One purchase per phone is enough. Play with family, friends or as a couple — everyone participates.
Point your phone at the façade: a historical character appears and speaks to you in your language. Golden letters magically write themselves on the wall to reveal the puzzle answer.
Stuck? Progressive personalised hints. The character repeats the puzzle on demand — at your own pace.
French, English, German, Spanish, Italian + 27 other languages auto-translated by AI.
Places tied to your adventure — optional entries, totally up to you · per person
5-10 curated sites across the territory
The gameplay: AR, camera, hidden clues
At each stop, open your phone camera: an augmented reality character appears on the façade and speaks your language. Hunt the clue — it materializes as golden letters on the real wall or floats in front of you. When you find it, the phone vibrates, an AR chest opens and reveals your answer fragment. 8 stops, 8 clues to find with the camera, 1 final code.
The stops on your route are a surprise. You'll discover them one by one, guided by your phone, starting from the meeting point.
One phone = one team. Pick the number at checkout (1 to 10).
Solo, or a group sharing the screen. One team, one code.
Family, couple, or 2-3 teams competing. Each phone has its own code and its own score.
Friends, bachelor/bachelorette, small office outing — each their own code, each plays at their own pace. Tiered pricing then €6 flat per phone from the 6th.
Ready to live this adventure?
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Gather evidence and testimonies to establish a chronology of atrocities and honor the memory of the victims.
Discover key sites from the dark history of Unit 731, transformed into places of memory and reflection.
Symbolically contribute to the restoration of collective memory by revealing a history that has too long been denied.
Their silence will never be in vain.
The light of truth illuminates the shadows of the past.
OddballTrip combines gamified play, augmented reality and AI. All our competitors deliver 1 or 2 of these angles. We deliver all 5.
A golden chest floats in front of the monument. Tap → opening animation → reveals a secret message.
Point your phone at the façade: a knight, witch, monk, sailor, detective or ghost appears full-screen and speaks to you in your language with their dedicated ElevenLabs voice (each character has their own unique voice) — your living guide.
At the puzzle climax, golden letters magically write themselves on the real wall — that's the puzzle answer. An unforgettable visual effect.
Every puzzle available as text AND voice-over: read at your own pace or listen eyes-free while walking. Great in groups and for accessibility.
A mini-radar shows the target even behind you, and the phone vibrates when you aim in the right direction.
Every puzzle weaves in real historical facts (architecture, era, anecdotes). You learn by playing — like a gamified audioguide.
3 levels of AI-generated help: vibe → where to look → answer format. You're never stuck.
At the end of the game, capture a selfie with OddballTrip banner + mascot, shareable on Instagram, TikTok.
PWA technology: open the link, it plays in your browser. Same quality as an app, no App Store hassle.
No, never. You get a link, you click, it plays in your browser. That's the point of a PWA: same as an app, without the hassle.
GPS yes (handled by your phone). Maps yes (tiles cached). AI and hints need an intermittent 4G connection.
1 h 30 to 2 h 30 depending on your pace. The timer runs but only for the leaderboard — you play at your own tempo.
You get 3 levels of hints per puzzle (increasing penalty). If truly stuck, you can skip the step (45-min penalty but you keep going).
From 12 without an adult, from 6 with an adult reading puzzles. Works for families, couples, friend groups, companies.
Pre-register or contact us — we'll email you as soon as your city is live.
Point your phone at the façade: a historical character appears full-screen and speaks to you in your language. At the puzzle climax, golden letters magically write themselves on the real wall — that's your answer. After each puzzle solved, a treasure chest floats in front of you. Seeing is believing.
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Delve into the forgotten layers of Harbin, where the echoes of Russian and Japanese empires still resonate through the streets of this border city in Hokkaido.
1 purchase = 1 phone. Play several on the same device.
No calendar booking. Code sent immediately by email.
🔒Secure payment · Code in 5 min · Free cancellation
🪙+24 TripCoins granted with your booking
More ideas for self-guided walking tours, scavenger hunts & city quests in the same city

Uncover the hidden Archives of Silence in Harbin's frozen streets. Decipher clues from Unit 731's atrocities, expose the buried secrets before they vanish forever.

Uncover the Forgotten Register of Unit 731, hidden amid the ruins. Decipher clues from labs, prisons, and incineration pits to expose the lost names of victims and unravel the darkest WWII biological conspiracy.

Uncover the broken oath of Unit 731's commander in Pingfang. Decode clues from ruins, labs, and prisons to expose the hidden archives of Japan's secret germ warfare atrocities before they vanish forever.
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Coupe-file disponibles pour les sites payants de votre parcours. Gagnez du temps, vivez l'aventure pleinement.
Accès libre. Explorez les vestiges des laboratoires souterrains de l'Unité 731, découverts en 1984, pour une compréhension approfondie des crimes de guerre.
Accès libre. Découvrez des artefacts originaux et des photos d'expériences sur 250 000 victimes estimées, établi sur le site réel de l'ancienne Unité 731.
Prix indicatif : 80-150 CNY. Savourez les saveurs uniques des plats locaux de Harbin, influencés par la cuisine russe et les traditions culinaires du nord-est.
Accès libre. Promenez-vous dans ce jardin public créé en 1902 sous influence russe, lieu de rassemblements historiques et hôte des festivals de glace hivernaux.
💡 Réservation optionnelle — vous pouvez aussi acheter sur place. Tous les liens ouvrent dans une nouvelle fenêtre, votre visite OddballTrip reste préservée.