Clervaux — Riddle of the Steel Heart
Uncover the heroic resistance of Clervaux in Winter 1944. Decode the riddle of the Steel Heart to reveal a forgotten act of bravery that saved civilians during the Battle of the Bulge.
📱 1 to 10 phones · 1 team per phone · Independent codes
Winter 1944, Clervaux historic center
Clervaux — Riddle of the Steel Heart
You are an Allied intelligence officer, newly deployed to the Clervaux sector in late 1944.
Your mission: decipher the remnants of World War II and understand the troop movements that shaped
Immerse yourself in the heart of the Luxembourg Ardennes, where Europe's fate was sealed during the Battle of the Bulge in December 1944.
The story that haunts this land
Your mission begins in front of the Clervaux Town Hall, a central administrative building in the heart of the pedestrian district. This strategic starting point, close to the main streets and Clervaux Castle, was a vital crossroads during the events of December 1944. As a reconnaissance officer, you examine the surroundings, searching for clues left by the Battle of the Bulge. The historic center of Clervaux, in the heart of the Luxembourg Ardennes (Éislek), reveals its network of hiking and mountain biking trails, but for now, your attention is focused on the traces of a darker, more recent past.
Heading towards Clervaux Castle, built in the 12th century, you overlook the town's skyline. This medieval castle, historical seat of the Counts of Clervaux and then the Counts of Lannoy from the 17th century, has been a silent witness to centuries. It is now a key stop on the Éislek Pad Clervaux, a 13 km trail. Imagine the messages conveyed by the Counts of Lannoy, whose influence extended over the former deer park of Clervaux. Augmented reality allows you to overlay archival images onto the walls, revealing the fortifications and strategic positions during World War II in the Diekirch region.
The route takes you to the Former Deer Park of Clervaux, whose origins date back to the 17th century, directly linked to the local nobility and the Counts of Lannoy. This place, featured on the topographic maps of Count Joseph de Ferraris in 1771-1778, was once a privileged hunting ground. Today, a 3 km hiking trail with QR codes and audio stations explores the regional hunting culture. For your mission, this ~2 km walking route, exploring landmarks related to World War II, allows you to identify potential observation points and retreat paths, all while immersing yourself in the history of Clervaux.
Crossing the Clerve, the river winding through Clervaux, you take a footbridge integrated into the historic city center's pedestrian paths, close to the Town Hall and the castle. The typical Ardennes landscape of Éislek, the northern region of Luxembourg, offers a striking contrast to military events. Clervaux Market Square, a central historic square in the pedestrian district, connects the Town Hall and the castle, and was an important gathering point. Clervaux Church, a medieval parish building, is another key landmark on the 2 km walking route, having witnessed WWII events in the occupied town.
Your exploration of Clervaux's historic center concludes, but your understanding of the stakes of the 1944 Battle of the Bulge and the heritage of Éislek Luxembourg is strengthened. You have followed a walking itinerary, exploring sites that have seen centuries of history, from medieval lords to modern conflicts. Every step in Clervaux's pedestrian streets has revealed layers of history, from the legends of the Counts of Lannoy to the scars of battle. You leave with a new vision of Diekirch and its monuments, having deciphered the riddle of Clervaux's steel heart, a town that has preserved its soul despite the turmoil.
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.
The game downloads to your phone on start. Once the "✓ Downloaded" indicator appears, everything works without data — narration, AR, GPS and puzzles. Perfect abroad without a data plan.
Want to go deeper?
Places tied to your adventure — optional entries, totally up to you · per person
The Route
5-10 curated sites across the territory
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?
American Heroism
Follow in the footsteps of the soldiers who defended Clervaux with incredible bravery.
Ruthless Siege
Immerse yourself in a desperate siege and feel the pressure of combat.
Retreat Route
Reconstruct a secret route for the evacuation of civilians and the wounded.
The fate of the last defenders is in your hands.
Unveil the 'Steel Heart' to save lives.
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
Q01Is this an outdoor escape game in Clervaux, Luxembourg or a classic scavenger hunt?
Both at once: it's an outdoor escape game — team puzzles, narration, clues, final code — but in the streets of Clervaux, Luxembourg, at your pace. The classic scavenger hunt mechanic plus augmented reality through the camera.
Q02How long does it take to finish Clervaux — Riddle of the Steel Heart?
Plan 1 h 30 to 2 h 30 depending on your pace. Some finish in 1 h 10, others take 3 h in slow-mode. No pressure: the clock only counts for the leaderboard, you play at your tempo.
Q03Is Clervaux — Riddle of the Steel Heart good for a hen / stag party?
Great fit: no costume required, the team really collaborates (it's not a linear path), and the final code earns you a souvenir photo. Pick a calm time slot — early afternoon usually.
Q04What happens if it rains in Clervaux, Luxembourg?
The game is playable in light rain — just keep your phone under a hood. For heavy thunderstorms, your code stays valid, you can postpone to another day at no cost.
Avis des aventuriers
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Your turn to play
Immerse yourself in the heart of the Luxembourg Ardennes, where Europe's fate was sealed during the Battle of the Bulge in December 1944.
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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