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Uncover the dark secret buried in the Stone Bridge's construction. Decode medieval clues across Regensburg's landmarks to expose the conspiracy that halted its final arch and doomed its master builder.[1][2][3]
📱 1 to 10 phones · 1 team per phone · Independent codes
In 1135, as Regensburg thrived as a key trading hub on the Danube, construction began on the Stone Bridge—a marvel of 16 stone arches defying the river's fury
You are Konrad III's imperial emissary, tasked in 1146 with securing Bavaria's vital trade routes and inspecting the Stone Bridge's construction in Regensburg.
Your mission
Delve into Regensburg's millennial layers, where Roman remains and medieval masterpieces tell the story of a Danube crossroads city.
You're not just buying an escape game. You're carrying a living guide — historical anecdotes, forgotten legends, key monuments, hidden architecture — unfolding as you go.
At each stop, places ordinary guides miss — secret façades, sculpted crests, alleys steeped in history.
Every riddle is rooted in a real historical fact or local legend. You leave with dozens of stories to tell.
Learn to read buildings — flamboyant Gothic, Baroque, Art Deco — like a real art historian, while having fun.
Walk through the city like a novel's character — every alley becomes a stage, every square a theatre.
A voice walks with you at every step, tells the story of each place, reads clues, adds a cinematic feel.
Keep access to the guide & game for 1 year. Come back any time, share it with friends.
« You will not leave this city the way you entered it. »
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
Your quest in Regensburg begins in front of the Porta Praetoria, an imposing remnant of the Castra Regina legionary camp. Erected around 179 AD under Emperor Marcus Aurelius, this 12-meter-high Roman gate, with its two limestone arches, marks the entrance to the ancient city. It was the base of a 30-hectare Roman camp housing 6,000 legionaries, the direct ancestor of today's city. A UNESCO World Heritage site since 2006, the Porta Praetoria offers a first glimpse into Regensburg's rich past, a UNESCO historic city in the heart of Bavaria, and the engineering challenges of the Roman Empire.
Continue towards the Brückturm, the 13th-century watchtower protecting the entrance to the famous Stone Bridge. This 15-meter-high tower, visible from Am Watmarkt, was a strategic control point and a toll collection site on the Danube. It was integrated into the medieval fortifications, connecting the bridge to the city and ensuring its defense. By exploring this historic monument of Germany, you understand the vital role of tolls for Regensburg's prosperity, which became a flourishing commercial center thanks to its control over Bavaria's river and land trade routes.
The Stone Bridge (Steinerne Brücke) itself is a masterpiece of medieval masonry, built between 1135 and 1146 under Emperor Konrad III. 310 meters long with 16 entirely stone arches, it was the only bridge over the Danube in Regensburg for centuries. This historic monument, Germany's and the Danube's oldest surviving bridge, connected north-south trade routes, fostering the city's rise. On the bridge, the Brückenkapelle, a 14th-century Gothic chapel dedicated to Saint James, served pilgrims and merchants, a rare example of a medieval pontifical chapel in Germany, restored in the 20th century and an integral part of the UNESCO monument.
Your journey then takes you to Am Weinmarkt, a historic square that was the wine market in the Middle Ages, a district adjacent to the Stone Bridge and the Danube. The 16th to 18th-century gabled buildings, typical of Bavarian Renaissance architecture, bear witness to Regensburg's past opulence as a medieval commercial center near the quays. 200 meters from the Porta Praetoria, this square is now a tourist site, with its listed patrician houses. It illustrates the continuity of trade and urban life in Regensburg, connecting the Roman and medieval eras.
Finally, your exploration leads you to Domplatz, dominated by Dom St. Peter (Regensburg Cathedral), whose construction began in 1273. This Gothic masterpiece, completed in the 16th century with its 105-meter-high towers, was a site of medieval imperial coronations, linked to the history of the Hohenstaufen. The 14th-century Gothic stained glass windows and the historic organ complete this edifice, Regensburg's religious heart. An interactive visit to the Historisches Museum Regensburg, founded in 1925 in the former 13th-century Dominican chapel near Domplatz, will offer you a comprehensive perspective on Regensburg's history, from the Neolithic to the modern era, including Danubian trade and the Stone Bridge, consolidating your understanding of this UNESCO historic city.
8 stages through the city
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?
Get my code · 12€No calendar booking. Code sent immediately by email.
🔒 Secure payment · Code in 5 min · Free cancellation
Explore Germany's oldest stone bridge, a medieval engineering marvel.
Decipher the techniques and principles that ensured the longevity of this structure.
Go back in time to find a forgotten plan, essential to understanding the bridge.
The past reveals its foundations
An engineering and history challenge awaits you.
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 Regensburg's millennial layers, where Roman remains and medieval masterpieces tell the story of a Danube crossroads city.
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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Coupe-file disponibles pour les sites payants de votre parcours. Gagnez du temps, vivez l'aventure pleinement.
Environ 15-20€. Explorez Regensburg depuis le fleuve, offrant une perspective unique sur le Pont de Pierre et les rives historiques de la ville.
Environ 8€. Découvrez les collections permanentes sur l'histoire de la ville, du Néolithique à l'époque moderne, dans l'ancienne chapelle des Dominicains du XIIIe siècle.
Accès libre. Admirez les vitraux gothiques du XIVe siècle et l'architecture des tours de 105 mètres de la Dom St. Peter, cœur religieux de Regensburg.
Prix variés. Goûtez la célèbre 'Regensburger Wurst' dans l'une des brasseries traditionnelles près du Danube, une spécialité culinaire de Bavière.
💡 Réservation optionnelle — vous pouvez aussi acheter sur place. Tous les liens ouvrent dans une nouvelle fenêtre, votre visite OddballTrip reste préservée.