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Decipher survivor accounts and excavated evidence to expose the truth of the 1937 massacre and honor those whose voices were silenced.
📱 1 to 10 phones · 1 team per phone · Independent codes
December 13, 1937
You are a Western journalist present in Nanjing, December 1937.
You arrive at the Massacre Memorial, first stop of an investigation that will take you 1.5 km through
Dive into the hidden testimonies of the December 1937 Nanjing Massacre, following the traces of 250,000 refugees saved by the International Safety Zone.
The Nanjing Massacre Memorial, inaugurated on December 13, 1985, rises over 28,000 m² exactly where the Japanese army massacred more than 300,000 Chinese civilians. The monumental sculpture 'The 300,000 Fallen' welcomes you: a giant relief triangle showing victims in struggle. Built on a mass grave exhumed in 1985, the site preserves interviews with Chinese survivors, Japanese soldiers' diaries, and testimonies from foreigners who lived through the horror. Free admission during Golden Week allows millions of Chinese to come pay respects each year.
Nanjing's city wall, built under the Ming dynasty between 1366 and 1393, extends 33.4 km with an average height of 12 meters. In December 1937, these millennial stones become the theater of mass executions perpetrated by the Japanese army. The section near Jiangdongmen, preserved and accessible on foot from the Memorial, still bears traces of this tragedy. You walk along these witness ramparts, where each stone seems to whisper the victims' last words.
John Rabe's house, located in the Jiangdongmen district, has housed since 2005 the museum of this German businessman who became an unlikely hero. A Nazi party member, Rabe leads the International Safety Zone from December 13, 1937 to February 1938, saving between 200,000 and 250,000 Chinese. His detailed diary, published posthumously, constitutes one of the most damning historical evidence of Japanese atrocities. In this restored residence, you discover how a Nazi defied Germany's ally.
Gulou Hospital, founded in 1892 by American Protestant missionaries, becomes one of China's first modern hospitals. In December 1937, its corridors welcome thousands of massacre victims and serve as refuge in the Safety Zone. Located 1.5 km from the Memorial via pedestrian routes, this historic building in the university district testifies to medical resistance against barbarity. Western doctors operate tirelessly under the precarious protection of international neutrality.
Your journey ends at Nanjing University's Gulou campus, former seat of Jinling University founded in 1902. These republican architectural buildings from the 1920s-1930s sheltered refugees and served as International Safety Zone posts. Walking these paths where today's students mingle with yesterday's ghosts, you take away more than a history lesson: proof that humanity can resist the worst darkness, even when all seems lost.
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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Give voice back to the silenced stories and cut-short lives, by collecting clues that trace the horror experienced by Nanjing's civilians and defenders.
Each solved puzzle is a step towards recognizing historical truth and a tribute paid to the 300,000 victims of the massacre.
Discover the courage of heroic figures like John Rabe and Minnie Vautrin, whose actions saved thousands of lives at the risk of their own.
Memory is not a burden, but a beacon for the future.
Honor the past, build a future of peace.
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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Dive into the hidden testimonies of the December 1937 Nanjing Massacre, following the traces of 250,000 refugees saved by the International Safety Zone.
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
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💡 Réservation optionnelle — vous pouvez aussi acheter sur place. Tous les liens ouvrent dans une nouvelle fenêtre, votre visite OddballTrip reste préservée.