The Mulberry Harbour
The impossible harbour Churchill conjured from the sea
📱 1 to 10 phones · 1 team per phone · Independent codes
In 10 days, the Allies built an artificial harbour the size of the port of Dover in the open sea, off the Norman coast. A German saboteur stole the plans. Find them before the tide rises.
When the sea won't cooperate, you build the land
From the beach at Arromanches, you can still see them: those massive concrete blocks sitting on the sand and in the water, remnants of one of the greatest military engineering feats in history. The Mulberry harbour supplied 2.5 million soldiers, 500,000 vehicles, and 4 million tons of equipment. Without it, the invasion would have failed. A German saboteur knew this — and tried to steal the plans.
« "Don't forget the beaches in your plan. The beaches are non-negotiable." »— — Winston Churchill to Operation Overlord planners, 1943
Mulberry — the greatest secret construction project of the war
After the bloody failure of the Dieppe Raid in 1942, the Allies realize they cannot capture a working port during the invasion. The solution: build one from scratch. Churchill scribbles on a memo: "Piers for use on beaches. They must float up and down with the tide." It is the beginning of the war's most audacious project.
Two artificial harbours are built in secret in England: Mulberry A (for the Americans at Omaha) and Mulberry B (for the British at Arromanches). Each harbour includes 6,000-ton Phoenix caissons towed across the Channel, floating Whale piers, and pontoon roads. On June 7, the first elements are put in place. By June 18, the Arromanches port is operational.
On June 19, a terrible storm destroys Mulberry A at Omaha. But Mulberry B at Arromanches survives and becomes the logistical lifeline of the Battle of Normandy. For 100 days, it unloads the equivalent of 7,000 tons of equipment per day. The vestiges you see in the sea at Arromanches are the silent witnesses of this feat — concrete blocks that changed the course of the war.
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.
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 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?
War engineering
Discover how the Allies built an artificial harbour the size of Dover's port in 10 days.
Vestiges in the sea
The Phoenix caissons are still visible from the beach — concrete monuments sitting in the Channel since 1944.
Saboteur hunt
A spy scenario blended with the real story of D-Day's greatest logistical feat.
British heritage
Gold Beach was the British sector — discover the crucial role of the United Kingdom in the liberation of Europe.
Victory is also won with concrete.
The harbour that fed freedom.
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
Q01What's the difference with a regular indoor escape room?
Outdoor escape game format: no physical locks, no actor, no fixed time slot. You start when you want, progress through Arromanches-les-Bains · Beach & Mulberry harbour vestiges with your phone, and the city itself is the set. More immersive on local history, more flexible in pace.
Q02What walking pace should we expect?
Easy stroll: between stops you walk 3 to 7 minutes. No tough climbs unless flagged on the product page. If you really want to push, you can jog between stops, but that's not the point.
Q03Is The Mulberry Harbour 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.
Q04Is The Mulberry Harbour stroller-accessible?
Depends on the exact route in Arromanches-les-Bains · Beach & Mulberry harbour vestiges. The vast majority of stops are downtown, on sidewalks or squares. If a stair or narrow passage is involved, it's flagged on the product page. Generally: yes, doable with a standard urban stroller.
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Your turn to play
Facing the vestiges of the Mulberry harbour, track a German saboteur in an outdoor escape game that reveals D-Day's greatest engineering feat.
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
🪙+15 TripCoins granted with your booking
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