Olbia — Constantine's Sunken Secret
In 324 AD, a ship carrying Constantine's sacred secret sank off Olbia. Uncover the loyal prefect's 8 hidden clues across ancient ruins to decipher the emperor's lost message before it's gone forever.
📱 1 to 10 phones · 1 team per phone · Independent codes
In 324 AD, as Emperor Constantine prepared to reshape the empire with his new faith, an imperial galley laden with a sacred relic—the coded decree proclaiming Christianity's supremacy—met disaster in
Olbia — Constantine's Sunken Secret
You are a nascent Christian scholar in Olbia, 4th century AD, tasked by Saint Simplicius, the city's first bishop, to investigate the origins of Christian faith against ancient cults
Discover Olbia, Sardinia's millennial port city, where Carthaginian and Roman remains whisper the secrets of a Mediterranean empire swallowed by centuries.
The story that haunts this land
Your journey begins at the Mura Puniche, Via Torino, fortifications erected in the 3rd century BCE by the Carthaginians. These partially preserved remains bear witness to Carthage's presence in Olbia before Roman domination, defending an ancient port vital for Mediterranean trade. By walking these stones, you grasp the strategic importance of this city for ancient powers, a gateway to Sardinia's archaeological sites, where each layer tells a tale of conquest.
Corso Umberto I, a main thoroughfare laid out in the 19th century, leads you through Olbia's historic center. This street connects the port areas to archaeological remains, lined with modern buildings and traditional shops. It is a mandatory passage for any walking tourist circuit in the city center, and a place where the history of Olbia-Tempio is superimposed on contemporary life, revealing how urban modernization was built upon a rich past.
Continue towards Porto Romano, an ancient port dating from the 1st-2nd century CE, where Olbia was a strategic Roman commercial center connecting Sardinia to Rome. Archaeological remains of quays and anchors, visible in situ, along with discovered Latin inscriptions, mention the trade of wheat and Sardinian products. This Roman port in Sardinia embodies the region's economic dynamism under the Empire, an eloquent testimony to Olbia's Roman heritage.
The Basilica di San Simplicio, an early Christian church built between the 6th and 7th centuries, is dedicated to Saint Simplicius, Olbia's first bishop and martyr. Its Byzantine architecture with Romanesque elements, featuring three naves, was restored in the 19th century and is listed as a historical monument of Sardinia. Nearby, Piazza Regina Margherita, developed in the 19th century in tribute to Queen Margherita of Italy, offers a gathering space with fountains and public gardens, in direct contact with Roman and Punic remains.
The journey concludes at the Museo Archeologico Nazionale di Olbia, founded in 1938 and renovated in 2000. Its collections, with over 2000 artifacts, span from Prehistory to the medieval era, with sections dedicated to the Phoenicians, Carthaginians, and Romans. From here, you understand the breadth of Olbia's history, from the 1st-2nd century CE of the Roman Aqueduct that supplied the city, to the discoveries of mosaics and ceramics at the Area Archeologica Via Nanni. This historical escape game in Sardinia will have taken you on a journey through layers of time, making you a true explorer of Olbia's past.
A game, a guided tour and a heritage guide — all in one
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. »
How does it work?
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.
Want to go deeper?
Places tied to your adventure — optional entries, totally up to you · per person
The Route
8 sites to explore by car within the day
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.
How does it work with a group?
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.
- ✓All codes are independent — play at the same time OR separately, each team advances at its own pace.
- ✓Leaderboard between your teams + global game leaderboard — each score appears in the public ranking.
- ✓More than 10 phones or need a personalized quest? Discover custom tours.
Ready to live this adventure?
Get my code · 14,90€No calendar booking. Code sent immediately by email.
🔒 Secure payment · Code in 5 min · Free cancellation
Practical info
Why this route?
Immersion in the Roman Port
Explore the quays and remains of the port that was the scene of the imperial drama. Visualize the merchant ships and military galleys of antiquity.
Decipher Lucius' Plan
Reconstruct the fragments of a rescue plan left by Prefect Lucius Valerius to find Constantine's precious cargo.
At the Origins of Christianity
Walk through the places that witnessed the emergence of the new faith under Constantine's reign, leaving deep marks in the city's architecture and symbols.
Reveal the secret swallowed by Olbia's waters!
The fate of the Empire could depend on your discovery.
9 features nobody else has
OddballTrip combines gamified play, augmented reality and AI. All our competitors deliver 1 or 2 of these angles. We deliver all 5.
AR treasure chest
A golden chest floats in front of the monument. Tap → opening animation → reveals a secret message.
AR narrator character
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.
Magic golden letters
At the puzzle climax, golden letters magically write themselves on the real wall — that's the puzzle answer. An unforgettable visual effect.
Written + audio narration
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.
360° radar + vibration
A mini-radar shows the target even behind you, and the phone vibrates when you aim in the right direction.
Heritage storytelling
Every puzzle weaves in real historical facts (architecture, era, anecdotes). You learn by playing — like a gamified audioguide.
Progressive AI hints
3 levels of AI-generated help: vibe → where to look → answer format. You're never stuck.
AR selfie memento
At the end of the game, capture a selfie with OddballTrip banner + mascot, shareable on Instagram, TikTok.
Zero app to install
PWA technology: open the link, it plays in your browser. Same quality as an app, no App Store hassle.
Frequently asked questions
Q01Do I need to download an app?
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.
Q02Does it work offline?
GPS yes (handled by your phone). Maps yes (tiles cached). AI and hints need an intermittent 4G connection.
Q03How long does a game take?
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.
Q04What happens if I'm stuck?
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).
Q05What's the age range?
From 12 without an adult, from 6 with an adult reading puzzles. Works for families, couples, friend groups, companies.
Q06What if my city isn't in the catalogue?
Pre-register or contact us — we'll email you as soon as your city is live.
Q07What is augmented reality exactly?
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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Your turn to play
Discover Olbia, Sardinia's millennial port city, where Carthaginian and Roman remains whisper the secrets of a Mediterranean empire swallowed by centuries.
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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