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Uncover the hidden conspiracy behind Soignies' Blue Stone quarries. Decode ancient symbols carved into landmarks to expose a 19th-century plot that vanished a master's final masterpiece and fortune.
📱 1 to 10 phones · 1 team per phone · Independent codes
In the heart of Soignies, the Blue Stone—known as Petit Granit—has shaped empires for centuries, quarried from depths holding secrets 350 million years old
You are Charles de Croy, Count of Chimay and a dedicated patron of local quarries in 16th-century Soignies, seeking the ideal stone vein for your next grand constructions.
Your
Uncover the ancient secrets of Soignies Blue Stone, the material that has shaped the face of Wallonia from the Middle Ages to today.
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 for the Secret of the Blue Stone begins in Soignies' Place Verte, the historic heart of the city. Since the Middle Ages, this central square has been the gathering point for many local events, and it is surrounded by buildings made of local blue stone. These stones, extracted from nearby quarries since the 19th century, give you a first glimpse of the raw material that made Soignies and Wallonia famous. Here, you collect the initial clues about the economic and architectural importance of Wallonia's Petit Granit.
As you head towards the Collegiate Church of Saint-Vincent, a Romanesque edifice built between 1030 and 1040, and classified as a major heritage site of Wallonia, you grasp the scale of local craftsmanship. Its 75-meter-high bell tower, one of Belgium's tallest, dominates the landscape, and its facades are entirely made of Soignies blue stone. It is here that Pierre le Bon, Prince-Bishop of Liège, could have admired the mastery of 11th-century builders, making this collegiate church a lasting testament to the use of blue stone.
Your journey then leads you to the Soignies Town Hall, a neoclassical building erected in 1784. This administrative center, with its local blue stone facade, illustrates the evolution of Soignies' architecture in the 18th century. Next, the Maison du Bailliage, the former residence of the seigniorial representative dating from the 17th century, offers a glimpse into Flemish Renaissance architecture, also adorned with carved blue stone elements, bearing witness to the princely judicial system under the Counts of Hainaut.
The Old Palace of Justice, built around 1830 after Belgian independence, and the Château de la Rocq, rebuilt in 1865 on 13th-century medieval foundations, continue to reveal the many facets of Soignies Blue Stone. The Palace of Justice, used for civil and criminal courts until the 20th century, incorporates blue stone for its foundations. The Château de la Rocq, with its facades blending brick and locally extracted blue stone, and its 2-hectare park, demonstrates the persistence of this material in prestigious constructions.
Your exploration concludes in Place du Perron, where the perron, a symbolic column of communal power erected in 1619, awaits you. Classified as a historical monument since 1952, it is surrounded by 17th-18th century gabled houses, all made of blue stone. This circuit will have allowed you to delve into the heart of Soignies' heritage, to understand the importance of Soignies Blue Stone, and to discover an essential part of Wallonia's history, its builders, and its communal liberties.
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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Uncover the secrets of the blue stone, noble material of the greatest constructions.
Decipher the stakes of a trade network that linked Soignies to the court of Louis XIV.
Reconstruct a key document that reveals the unsuspected role of the city in French history.
The grandeur of an empire is also built with stone from elsewhere.
Unveil the secret of the blue stone that connects Soignies to Versailles.
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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Uncover the ancient secrets of Soignies Blue Stone, the material that has shaped the face of Wallonia from the Middle Ages to today.
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
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Coupe-file disponibles pour les sites payants de votre parcours. Gagnez du temps, vivez l'aventure pleinement.
5€. Explorez l'histoire géologique et industrielle de la Pierre Bleue de Soignies, avec des outils anciens et des échantillons de carrière.
12€. Découvrez les techniques d'extraction modernes et l'ampleur des gisements de Petit Granit Wallonie lors d'une visite guidée.
Gratuit. Un espace naturel protégé idéal pour une balade relaxante après votre exploration urbaine du patrimoine de Soignies.
💡 Réservation optionnelle — vous pouvez aussi acheter sur place. Tous les liens ouvrent dans une nouvelle fenêtre, votre visite OddballTrip reste préservée.