Clervaux — The Shadow's Oath
December 1944: Uncover the Shadow's Oath, a Nazi plot hidden in Clervaux's ruins to sabotage the Allied defense during the Battle of the Bulge. Decipher clues across war-torn landmarks to thwart it.
📱 1 to 10 phones · 1 team per phone · Independent codes
In the freezing winter of 1944, Clervaux stood as a strategic bulwark against the German Ardennes offensive
Clervaux — The Shadow's Oath
You are a Clervaux resistance operative, tasked with a critical mission for the town's survival, December 1944.
Your journey begins at Clervaux Castle's main
Immerse yourself in December 1944, in the Luxembourg Ardennes, as the Battle of the Bulge rages and Clervaux's fate hangs in the balance.
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 story that haunts this land
Your quest for truth in the Luxembourg Ardennes begins at Clervaux Castle, the official starting point for the escape game 'The Oath of Shadow'. This 12th-century castle, located at 11 Grand-Rue, stands as a silent witness to the events of December 1944. Today, it houses 'The Family of Man' international photographic exhibition, a collection of 503 photographs, as well as the 'Battle and Castle - Ardennes Offensive' museum, documenting the battles that marked the Diekirch region. Your first task is to decipher a hidden message within the medieval architecture of this fortress, connecting Clervaux's distant past to the present urgency.
The path then leads you to Saint-Cunibert Church, a major religious edifice in Clervaux's town center. An integral part of the medieval and post-medieval architectural heritage, this parish church is a historical landmark crossed by pedestrian routes. It is here, in the heart of the urban center, that resistance fighters sometimes hid. You will need to find a hidden symbol whose meaning will help you progress in your mission. This site is an essential milestone for understanding Luxembourg's cultural heritage and Clervaux's role in the events that shaped the Diekirch region.
Your investigation takes you to the Market Square, Clervaux's central square, the administrative and commercial heart since the Middle Ages. This historic public space has been the scene of many gatherings and exchanges. In December 1944, it was a crucial point of the fighting. By orienting yourself among the administrative and heritage buildings, you will have to reconstruct a fragmented map, revealing the movements of enemy troops. This step is crucial for your urban treasure hunt, plunging you into the heart of Clervaux's history and the Ardennes Offensive.
Continuing your walking tour in Clervaux, you will cross the Grand-Rue, the main artery and the town's tourist and historical heart. Approximately 2 km long, this pedestrian street connects key sites. You will pass in front of the Hôtel Koener, a historic building in the town center that is part of Clervaux's urban heritage. Further on, the Bridge over the Clerve, a key element of the urban topography, offers a perspective on the landscapes of the Luxembourg Ardennes (Éislek). It is at the War Memorial, a site of remembrance dedicated to the victims of world conflicts, that you will decipher a vital code, a direct testimony to the historical context of the Battle of the Bulge.
Your adventure concludes on the Sentier de la Blees, a hiking trail in Clervaux's immediate surroundings, part of the Luxembourg Ardennes hiking network. After traversing Clervaux's streets and its monuments, you will grasp the magnitude of the challenge faced by the 1944 resistance fighters. This GPS treasure hunt will have allowed you to discover Clervaux with your family, exploring historical tourism in northern Luxembourg and the monuments of Diekirch. You will take with you not only the memory of an outdoor escape game in Luxembourg, but also a deep understanding of this town's heritage, its role in history, and the resilience of its inhabitants in the face of the Ardennes Offensive.
The Route
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.
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 · 12€No calendar booking. Code sent immediately by email.
🔒 Secure payment · Code in 5 min · Free cancellation
Practical info
Why this route?
Military Strategy
Thwart enemy plans by analyzing troop movements and strategic points of the battle.
Winter 1944
Immerse yourself in the icy and tense atmosphere of the Battle of the Bulge.
War Espionage
Follow in the footsteps of a secret agent and decipher their message to uncover enemy intentions.
The fate of the counter-offensive rests on you.
Uncover the Shadow's Oath before it's too late.
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
Immerse yourself in December 1944, in the Luxembourg Ardennes, as the Battle of the Bulge rages and Clervaux's fate hangs in the balance.
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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