Lille — The Forgotten Watermark Fraud
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Old Lille, FranceLille — The Forgotten Watermark Fraud
📍 Old Lille, France·🕐 2h – 2h30·📍 ~2.5 km
Investigation
Also available as:HistoricalSpy thriller

Lille — The Forgotten Watermark Fraud

Decipher the 1887 industrial fraud scandal hidden in Lille's forgotten watermark. Track clues across historic landmarks to expose the counterfeiters and reclaim the lost fortune before it vanishes forever.

📱 1 to 10 phones · 1 team per phone · Independent codes

Difficulty
·From age 12 years
Starting point :Place du Général de Gaulle, Lille

In 1887, Lille's booming textile industry was rocked by 'L'Affaire du Filigrane Oublié'—a brazen fraud where counterfeiters infiltrated the city's paper mills, forging watermarks on luxury banknotes a

8
stages
~2.5 km
route
2h – 2h30
at your pace
🚶
walking

Delve into Lille's cobbled streets, capital of Flanders, to foil a forgotten fraud threatening the city's textile heritage.

Step into the shoes of a royal archivist dispatched by Louis XIV in 1667, as the city of Lille, newly annexed to the kingdom of France, is shaken by a counterfeit watermark affair. Your mission is to unmask the forgers undermining the Flemish textile economy. At each stage of this journey through Old Lille, open your phone: augmented reality period documents appear on the facades of private mansions, plans of Vauban's citadel emerge on the cobblestones, and coded messages whisper merchants' secrets. Over approximately 135 minutes and a 1.5 km walking route, you explore Lille's historic monuments, from iconic squares to hidden corners. More than an outdoor escape game: an interactive visit immersed in 2,000 years of history, with anecdotes revealed at each stop and confidential sites that classic guides overlook.

Far more than an escape game

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.

🏛️
Hidden historical gems

At each stop, places ordinary guides miss — secret façades, sculpted crests, alleys steeped in history.

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Anecdotes & legends

Every riddle is rooted in a real historical fact or local legend. You leave with dozens of stories to tell.

🏗️
Architecture & heritage

Learn to read buildings — flamboyant Gothic, Baroque, Art Deco — like a real art historian, while having fun.

🚶‍♀️
Immersive wandering

Walk through the city like a novel's character — every alley becomes a stage, every square a theatre.

🎙️
Immersive audio narration

A voice walks with you at every step, tells the story of each place, reads clues, adds a cinematic feel.

📲
Yours forever

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?

🏛️
Outdoor escape game

Explore the city on foot solving puzzles based on real historical facts. No locked room — the city is your playground.

📱
On your smartphone

No app to download. Play directly from your browser. Guided step by step, at your own pace.

👨‍👩‍👧‍👦
Unlimited players

One purchase per phone is enough. Play with family, friends or as a couple — everyone participates.

🎯
Augmented reality

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.

🤖
AI that helps you

Stuck? Progressive personalised hints. The character repeats the puzzle on demand — at your own pace.

🗣️
32 languages

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

Palais des Beaux-Arts de Lilleoptional
€12. Explore one of France's largest art collections, featuring works by Rubens, Goya, and Delacroix, housed in a 19th-century building.
Optionnel
/pers.
La Piscine - André Diligent Museum of Art and Industryoptional
€10. Discover this unique museum housed in a former Art Deco swimming pool from 1932, featuring applied and fine arts collections.
Optionnel
/pers.
Waffle and Speculoos Tastingoptional
€5-10. Taste Lille's sweet specialties in a traditional pastry shop, such as filled waffles or the famous speculoos biscuits.
Optionnel
/pers.
Guided Tour of the City Hall Belfryoptional
€7. Climb the 400 steps of the UNESCO-listed Belfry for a panoramic view of Lille and its surroundings, extending to Belgium on clear days.
Optionnel
/pers.
Budget if you do them all / pers.~0
« LILLE MŒNVS DESOLARE DVCATVS »
Inscription engraved on the facade of the Lille City Hall

The story that haunts this land

Your investigation begins at Place du Général de Gaulle, formerly Grand'Place or Place du Marché, the beating heart of Lille. Since the 17th century, this 12,000 m² area has been the scene of Flemish textile trade. In the center, the Column of the Goddess, erected in 1828, commemorates Lille's resistance in 1792 against the Austrians, standing 24 meters high. The buildings classified as Historic Monuments in 1886 surrounding it have seen generations of merchants, and perhaps also the forgers you are looking for. Analyze the engraved symbols, as the truth about the fraud often hides in the most anodyne details of this emblematic place in the Capital of Flanders.

A few steps away, the Old Bourse of Lille, built between 1652 and 1653 under Spanish rule, stands, classified as a Historic Monument in 1914. Its 2,600 m² paved inner courtyard, surrounded by 24 identical pavilions, housed the Merchants' Exchange, an ideal place for transactions and plots. It was here, in 1797, that the Treaty of Lille was signed between France and Great Britain, an event that marked the diplomatic history of the region. Observe the ornaments, as counterfeit watermarks might have been exchanged under these arcades. Rue Esquermoise, paved since the 17th century, lined with 17th-18th century private mansions, was an old commercial route for Flemish textiles. Number 67, a restored 18th-century private mansion, is in this district classified as a protected sector in 1964. These discreet places often served as a refuge for artisans and smugglers.

The path leads you to the Lille Opera, founded in 1751 as a performance hall, rebuilt in 1914 after a fire, and classified as a Historic Monument in 1922. Its 50-meter-long facade with 8 Corinthian columns, capable of accommodating 950 spectators, hosted the first performances of Berlioz's works in 1846. Although the current building dates after your era, the spirit of the Opera, a place of gathering and secrets, endures. The luxury and intrigues of the court mingled with business, offering forgers fertile ground for their schemes. Look for clues in augmented reality reconstructed period programs or posters, as the world of entertainment often served as a front for more obscure operations.

Notre-Dame-de-la-Treille Cathedral, elevated to cathedral status in 1916, was built between 1854 and 1872 in a Neo-Gothic style, replacing a 12th-century church destroyed in 1793. Its 70-meter-high bell tower and 19th-century stained-glass windows by the Lobin workshops tell a story of resilience and faith. While the current monument is more recent than your mission, the site has always been a place of pilgrimage and gathering. Forgers could have hidden evidence there, or even found refuge. The Vauban Garden, created in 1974 on the ramparts of Vauban's citadel (1670), covers 10 hectares and preserves remains of the fortifications inscribed as Historic Monuments in 1937. Formerly a military glacis until 1960, this strategic location, designed by the royal engineer Sébastien Le Prestre de Vauban, could have served as a secret meeting point for conspirators.

Your journey concludes at the Lille City Hall, built between 1432 and 1454 under the aegis of Philippe le Bon. Its belfry tower, culminating at 104 meters, is classified as UNESCO in 2004 and houses 30 bells. The motto 'LILLE MŒNVS DESOLARE DVCATVS', meaning 'Never abandon Lille, Duke', is engraved on its facade. It is here, the seat of municipal power since 1790, that crucial decisions for the city of Lille were made. Your investigation has uncovered the workings of the fraud and the ingenuity of the forgers. As a royal archivist, you have helped protect the heritage and economy of the Capital of Flanders, from its Hauts-de-France monuments to the thematic circuits revealing the history of Lille. This interactive family visit to Lille offered you a unique immersion into the history of this city, a true GPS augmented reality treasure hunt.

1853
Creation of the Lille Chamber of Commerce and Industry
1887
Beginning of the Forgotten Watermark Case
1890
The investigation is officially closed without resolution

The Route

8 stages through the city

The gameplay: AR, camera, hidden clues

📱Search clues with your cameraRA

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.

8
original puzzles
24
min of narration
🪙 24
TripCoins granted
16
GPS waypoints

How does it work with a group?

One phone = one team. Pick the number at checkout (1 to 10).

🧍
1 phone

Solo, or a group sharing the screen. One team, one code.

👥
2-3 phones

Family, couple, or 2-3 teams competing. Each phone has its own code and its own score.

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4 to 10 phones

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.
🕒No date to pick · Code valid 1 year · Play whenever you want

Ready to live this adventure?

Get my code · 15€

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🔒 Secure payment · Code in 5 min · Free cancellation

Practical info

Starting point
Place du Général de Gaulle, Lille
Directions on Google Maps
🕐
Duration
2h – 2h30
At your own pace
👥
Players
1 to 6 players
From age 12
📍
Distance
~2.5 km
Old Lille
Accessibility
Partial
Some cobblestones and narrow streets
🌐
Languages
17 languages
Built-in translation

Why this route?

🕵️

Cold Case Uncovered

Dive into the heart of a 19th-century Lille incident never solved. Each clue is a piece of evidence from the true crime Lille.

📜

Forgotten Archives

Use our AR technology to bring up historical press clippings and virtual testimonies at the crime scene Lille.

🕰️

Time Travel

Discover Old Lille from a new perspective, following the footsteps of Lille's criminals and industrial secrets of the Belle Époque.

Truth, even forgotten, always resurfaces.

Untangle a century of secrets.

★ Innovation 2026

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, WhatsApp, 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.

Avis des aventuriers

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Your turn to play

Delve into Lille's cobbled streets, capital of Flanders, to foil a forgotten fraud threatening the city's textile heritage.

15€
1 phone
28,70€
2 phones
41,20€
3 phones
52,50€
4 phones
62,50€
5 phones
70€
6 phones
77,50€
7 phones
84,90€
8 phones
92,40€
9 phones
99,90€
10 phones

1 purchase = 1 phone. Play several on the same device.

🕒No date to pick · Code valid 1 year · Play whenever you want
Get my code · 15€

No calendar booking. Code sent immediately by email.

🔒Secure payment · Code in 5 min · Free cancellation

🪙+24 TripCoins granted with your booking