Monte-Carlo — The Princess's Stone Code
Uncover the cryptic stone code left by a Russian princess to reclaim her lost fortune and avert her family's ruin amid Monte-Carlo's opulent casinos and gardens.
📱 1 to 10 phones · 1 team per phone · Independent codes
In the glittering haze of early 20th-century Monte-Carlo, exiled Russian princess Anastasia Volkonsky faced utter ruin
Monte-Carlo — The Princess's Stone Code
You are a financial auditor, dispatched to Monte-Carlo in 1863, tasked with verifying the burgeoning success of François Blanc's casino enterprise.
Your mission takes you through Monte-Carlo
Immerse yourself in the Belle Époque opulence of Monte-Carlo, following in the footsteps of the builders and legends who shaped the Principality.
The story that haunts this land
The adventure begins at the Place du Casino de Monte-Carlo, the beating heart of the district, inaugurated in 1863. Designed by Charles Garnier to surround the Casino, this 3-hectare square is bordered by luxury hotels and remains an emblematic tourist site for pedestrian strolls. It is here that François Blanc, from 1863, laid the foundations for the Casino's financial success, transforming Monte-Carlo into a renowned destination. By exploring this historic place, you will discover the first clues that will immerse you in the era of its initial development.
Your quest will then lead you to the Monte-Carlo Casino itself, a building constructed between 1856 and 1863 by Charles Garnier, inspired by the Paris Opéra. Its 103-meter long facade, adorned with 28 Corinthian columns in a neo-baroque style, bears witness to François Blanc's ambition. By 1870, the Casino was generating 25 million gold francs annually, proof of its dazzling success. Nearby, the Boulingrins Gardens, created in the 1860s, offer a 2-hectare green space with fountains and statues, named after 19th-century bowling games, and even hosted a 'Treasure Hunt' in 2021, proving their playful relevance.
Continue towards the Hôtel de Paris Monte-Carlo, opened in 1864 by François Blanc, contemporary with the Casino. This 7-story building with 182 rooms, its 35-meter tower, and Second Empire architecture, hosted personalities like Winston Churchill and Mata Hari in the early 20th century. Renovated in 2023 for €650 million, it retains its historic lounges, offering a window into the elegance of the era. The Opéra de Monte-Carlo, or Salle Garnier, inaugurated on February 5, 1879, by Sarah Bernhardt, is also a key stop. Its 524-seat capacity and 500 kg chandelier with 524 bulbs illuminate an interior painted by Alexandre Bénois in 1951, a masterpiece of Belle Époque heritage.
The Allée François Blanc, named in 1863 in honor of the Casino's founder, invites you for a 500-meter stroll connecting the Casino to the Opera and gardens. Planted with trees in the 1870s, it is an integral part of Monte-Carlo's tourist promenades. On the way to Port Hercule, a natural harbor modernized in the 1880s under Charles III, you will discover the 18th-century fortifications and the 2,150 berths accommodating yachts up to 175 meters. This port, named after the legendary Hercules, has always been at the heart of Monegasque activity.
The journey concludes at the Japanese Garden of Monaco, inaugurated in 1991 by Rainier III. This 7,000 m² garden, created on land reclaimed from the sea, was gifted by Japan and features bridges, waterfalls, and 200 Asian plant species. 700 meters from the Place du Casino via Avenue des Beaux-Arts, it offers a modern perspective on Monte-Carlo's development. This interactive visit to Monte-Carlo will have taken you through history, from 19th-century ambition to 20th-century cultural diversity, revealing the many facets of this classified Monaco heritage.
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
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?
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Practical info
Why this route?
An imperial legacy
Decipher the 'stone code' of a Romanov Grand Duchess to find her hidden treasure.
The elegance of exile
Immerse yourself in the glamorous yet melancholic atmosphere of Russian aristocracy in Monte-Carlo after 1917.
A coded logbook
Uncover the secrets of a diary where each location hides a clue to reconstruct a family survival plan.
Exile does not break the spirit, it tempers it.
Find the legacy of a Russian princess
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 Monte-Carlo — The Princess's Stone Code similar to a treasure hunt?
Same spirit: search, deduce, find. But here the "treasure" is a full story to piece together in eight stops. Each stop gives you a fragment of the final code. Eight fragments later, you've cracked it.
Q02How far do you walk in Monte-Carlo, Monaco?
Usually 2 to 4 km of total walking, within 1.5 km as the crow flies from the start point. The route is designed to be walkable at a relaxed pace, no public transport needed.
Q03Can we do Monte-Carlo — The Princess's Stone Code as a family with kids?
Yes, from age 6 with an adult reading puzzles aloud, and from age 12 on their own. Kids love the "find the camera clue" part — it's very visual, gets them genuinely involved.
Q04What's the best time to start?
Morning between 10 and 11, or early afternoon around 2 PM, is ideal. You still have daylight ahead, Monte-Carlo, Monaco is less crowded, and the light is better for camera clues.
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Immerse yourself in the Belle Époque opulence of Monte-Carlo, following in the footsteps of the builders and legends who shaped the Principality.
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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