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Solve the mystery of Lydéric's secret duel and expose the truth behind Phinaert's death. Decipher clues hidden in Lille's medieval heart to reclaim a stolen legacy.
📱 1 to 10 phones · 1 team per phone · Independent codes
In the year 640, a legendary duel shook the foundations of Lille
Step into the shoes of Lydéric of Flanders, the legendary founder of Lille, returned to haunt the city and fulfill an ancient oath. Your mission: uncover the mysteries of the "Forgotten Oaths" that link Place du Général de Gaulle to Place aux Oignons, passing through the historic sites of Hauts-de-France. At each stage of this GPS treasure hunt, open your phone: augmented reality clues appear on Flemish facades, engraved coats of arms, or ancient cobblestones. A spectral figure appears on the Vieille Bourse, letters light up on the Colonne de la Déesse, and a parchment fragment takes shape on the Palais Rihour. Over approximately 135 minutes of a 1.5 km journey, at your own pace, you trace your own itinerary through Old Lille — that of municipal archives and medieval chronicles blended into the urban landscape. More than an outdoor escape game: an interactive visit immersed in the history of Lille, with anecdotes revealed at each stop and confidential sites that classic guides often miss.
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
« Unity makes strength »— Official motto of the city of Lille
Your quest begins in Place du Général de Gaulle, Lille's Grand'Place. Surrounded by 68 gabled houses, mostly from the 18th century, this square was rebuilt after the 1914-1918 bombings. In the center, the Colonne de la Déesse, a 24 m high monument erected in 1933, commemorates the Lillois who died in 1914. It is here, since 1625, that France's largest flea market has been held every September, an event that has attracted crowds for 112 years. In 1954, the entire architectural ensemble of the square was classified as a Historic Monument, testifying to its importance in the heritage of Hauts-de-France. Lydéric whispers that it was on these cobblestones that the first oaths were sworn, sealing the city's destiny.
Continue towards the Vieille Bourse, a neoclassical building constructed between 1652 and 1656 by Julien de la Fosse, inspired by the Bruges Stock Exchange. Its 3,500 m² inner courtyard, surrounded by 24 arcaded pavilions, now houses a book market. Listed as a Historic Monument in 1923, the Vieille Bourse conceals dark corners where, according to municipal archives, clandestine duels took place in the 18th century. Lydéric's spirit will guide you through these passages, revealing echoes of past conflicts and secret pacts. This emblematic monument of Lille is a key point for understanding the rivalries that shaped the city's history.
Then take Rue de la Monnaie, a paved alley typical of the 17th-18th centuries, lined with Flemish houses with stepped gables. Formerly the street of money changers and goldsmiths, it has been named so since 1650, according to Lille's tax records. 250 m long, it is integrated into the historic district classified in 1962. This artery of Old Lille, rich in history, was the scene of transactions and conspiracies. Lydéric knows that fortunes were made and lost here, and that oaths of money were as powerful as those of blood. It is an ideal place to discover the heritage of Hauts-de-France and trades of yesteryear.
Your path leads you to the Cathédrale Notre-Dame-de-la-Treille, a Baroque cathedral built from 1842 to 1993, succeeding a 12th-century parish church destroyed in 1798. Its 50 m high facade is adorned with sculptures of saints, the work of architect Pierre-Joseph Verhaegen. Classified as a Historic Monument in 1913 for its 16th-century Renaissance portal, it has housed the ashes of Charles de Gaulle since 1982. This monument in Lille, despite its construction spanning over a century, is a spiritual and historical beacon, where oaths of faith have been whispered through the ages. Lydéric seeks here a trace of the alliance between the sacred and the profane.
The route concludes at Place aux Oignons, a small square in Old Lille dating from the 17th century, named after the 18th-century onion market. Its gabled houses, classified in 1958, are typical of Flemish architecture. This square was also a former dead-end for duels, mentioned in judicial archives from 1742. It is here that Lydéric's forgotten oaths take on their full meaning, where the shadows of duelists and merchants meet. By exploring this district of Lille, you have not only discovered historic monuments and the rich heritage of Hauts-de-France, but you have also participated in an interactive and immersive visit, unraveling the threads of a millennia-old history. This thematic circuit offers a unique perspective on "what to do in Lille" and "the history of Lille", far beyond traditional guides.
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.
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Dive into a founding myth of Lille, an epic and eventful love story.
Explore Old Lille through its iconic monuments, silent witnesses to centuries past.
Vibrate to the rhythm of the legend, linking the city's mythical past to its real heritage.
Lille: the city where love forges legend.
A story to live for two, a romantic weekend in Lille.
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, WhatsApp, 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 Lille's cobbled streets to unearth the secrets of a forgotten revenge, where the history of the Dukes of Burgundy intertwines with 18th-century clandestine duels.
1 purchase = 1 phone. Play several on the same device.
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