Geneva Old Town — The CERN Affair
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Old Town of Geneva, SwitzerlandGeneva Old Town — The CERN Affair
📍 Old Town of Geneva, Switzerland·🕐 2h30 – 3h·📍 ~3 km
Also available as:HistoricalMysterySpy thrillerCinemaFantasy

Geneva Old Town — The CERN Affair

Uncover the Cold War espionage plot linking Geneva's Reformation walls to CERN secrets. Decode historic clues to expose the traitor who nearly sabotaged particle physics breakthroughs.

📱 1 to 10 phones · 1 team per phone · Independent codes

Difficulty
·From age 14 years
Starting point :Place de Cornavin (Cornavin Train Station)

In the shadowy heart of Geneva's Old Town, during the tense Cold War era, a brilliant physicist working at nearby CERN vanished without a trace

8
stages
~3 km
route
2h30 – 3h
at your pace
🚶
walking

Geneva Old Town — The CERN Affair

🎭Your Mission

You are a resistance liaison agent, deep within Geneva in 1943, tasked with securing vital information hidden within the city's monuments.

Your ~165-minute journey, a

Delve into the secrets of Geneva, city of the Reformation and crossroads of nations, where every stone whispers the history of fierce independence.

« After darkness, light »
Official motto of Geneva, 16th century

The story that haunts this land

Your mission begins at Geneva-Cornavin Station, inaugurated in 1858 and designed by Guillaume Fatio. This imposing 120-meter-long neoclassical structure was the starting point for international railway links to France, Italy, and Germany. A commemorative plaque recalls its crucial role in resistance movements during World War II, marking the start of your investigation into Geneva's heritage. It is here that information transits, hidden in the flow of travelers and urban symbols. The city of Geneva opens its doors to you, revealing its layers of history.

Next, cross the Pont des Bergues, built in 1834 to connect Île Rousseau to downtown Geneva. 155 meters long, this white limestone structure is named in honor of the Bergues brothers, 16th-century Genevan merchants. Rebuilt in 1862 after a partial collapse and restored in 1999, it is a testament to Geneva's resilience. From this bridge, the Geneva Jet d'Eau, built in 1891, rises 140 meters high. Initially a pressure regulation system for the Rhône hydraulic plant, it became Geneva's official symbol in 1920, visible up to 15 km away on a clear day.

Continue towards Rue du Rhône, the main commercial artery since the 16th century. This 800-meter street is lined with prestigious 18th and 19th-century buildings, housing Geneva's watchmaking and luxury center. It was the former link road between the Rhône river port and the old town, a vital axis for trade. The watch manufacturers Patek Philippe (since 1839) and Vacheron Constantin have their historic headquarters here. Place du Molard, an ancient 13th-century medieval stronghold, was a strategic crossroads for trade routes to the Rhône and the Alps from the Middle Ages.

The Geneva City Hall, whose initial construction dates back to 1455, with successive wings added until the 18th century, is your next stop. Its Genevan Renaissance facade and 52-meter-high clock tower (1540) house the seat of the Council of State. The double-revolution staircase (1610) is an architectural masterpiece, allowing two simultaneous accesses. Nearby, Saint-Pierre Cathedral of Geneva, begun in 1160 and consecrated in 1232, is a Swiss historical monument. Its Calvin's Pulpit (1564) recalls John Calvin's 28 years of preaching, a pillar of the Protestant Reformation in Geneva.

Your journey finally leads you to Parc La Grange, a 16-hectare estate acquired by the City in 1918, formerly owned by the de Candolle family. This park, one of Geneva's largest, houses a historic rose garden created in 1946 and labeled a botanical site. Although the 18th-century Château La Grange is closed, the park offers a perspective on Geneva's evolution beyond its fortifications. This exploration of Geneva's heritage will have allowed you to trace the complex history of Geneva Old Town, from the Protestant Reformation to its contemporary role, a true thematic circuit at the heart of Geneva's monuments.

Upon completing this GPS treasure hunt, you will have explored an essential part of Geneva's history. Each site, from Geneva-Cornavin Station to Parc La Grange, has revealed a facet of its past, from resistance movements to its status as a city of the Reformation. This interactive visit, avoiding beaten paths, offers you a deep understanding of Genevan heritage. You leave not only with memories but a new perspective on what to do in Geneva, enriched by this immersive exploration of its monuments and its role as a local UNESCO Heritage site.

1954
Creation of CERN, symbol of international scientific collaboration.
1973
Inauguration of the first colliding particle accelerator, the SPS.
1989
Tim Berners-Lee invents the World Wide Web at CERN.
Far more than an escape game

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.

🏛️
Hidden historical gems

At each stop, places ordinary guides miss — secret façades, sculpted crests, alleys steeped in history.

📜
Anecdotes & legends

Every riddle is rooted in a real historical fact or local legend. You leave with dozens of stories to tell.

🏗️
Architecture & heritage

Learn to read buildings — flamboyant Gothic, Baroque, Art Deco — like a real art historian, while having fun.

🚶‍♀️
Immersive wandering

Walk through the city like a novel's character — every alley becomes a stage, every square a theatre.

🎙️
Immersive audio narration

A voice walks with you at every step, tells the story of each place, reads clues, adds a cinematic feel.

📲
Yours forever

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?

🏛️
Outdoor escape game

Explore the city on foot solving puzzles based on real historical facts. No locked room — the city is your playground.

📱
On your smartphone

No app to download. Play directly from your browser. Guided step by step, at your own pace.

👨‍👩‍👧‍👦
Unlimited players

One purchase per phone is enough. Play with family, friends or as a couple — everyone participates.

🎯
Augmented reality

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.

🤖
AI that helps you

Stuck? Progressive personalised hints. The character repeats the puzzle on demand — at your own pace.

🗣️
32 languages

French, English, German, Spanish, Italian + 27 other languages auto-translated by AI.

📵
Playable offline

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

International Museum of the Reformationoptional
€13. Explore the origins and impact of the Protestant Reformation in a historic building opposite Saint-Pierre Cathedral.
Optionnel
/pers.
Geneva Museum of Art and Historyoptional
Free. Discover archaeological, fine arts, and applied arts collections tracing the history of Geneva and humanity.
Optionnel
/pers.
Swiss Fondue Tastingoptional
€30-50. Enjoy a traditional cheese fondue in a typical Old Town Geneva restaurant, after your exploration.
Optionnel
/pers.
Lake Geneva Cruiseoptional
€15-25. Admire the Jet d'Eau and the shores of Geneva from the lake, a unique perspective on the Genevan landscape.
Optionnel
/pers.
Budget if you do them all / pers.~0

The Route

8 stages through the city

The gameplay: AR, camera, hidden clues

📱Search clues with your cameraRA

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.

8
original puzzles
24
min of narration
🪙 24
TripCoins granted
16
GPS waypoints

How does it work with a group?

One phone = one team. Pick the number at checkout (1 to 10).

🧍
1 phone

Solo, or a group sharing the screen. One team, one code.

👥
2-3 phones

Family, couple, or 2-3 teams competing. Each phone has its own code and its own score.

👨‍👩‍👧‍👦
4 to 10 phones

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.
🕒No date to pick · Code valid 1 year · Play whenever you want

Ready to live this adventure?

Get my code · 12€

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🔒 Secure payment · Code in 5 min · Free cancellation

Practical info

Starting point
Place de Cornavin (Cornavin Train Station)
Directions on Google Maps
🕐
Duration
2h30 – 3h
At your own pace
👥
Players
Unlimited
From age 14
📍
Distance
~3 km
Right & Left Bank Area
Accessibility
Full
Mostly flat route
🌐
Languages
17 languages
Built-in translation

Why this route?

⚛️

Scientific Secrets

Dive into the world of cutting-edge research, coveted by spies.

🔬

Technological Espionage

Thwart attempts to steal intellectual property and know-how.

🕵️‍♀️

Counter-Espionage

Identify and neutralize enemy agents infiltrated in the scientific community.

Knowledge is power, but its control is the ultimate power.

Safeguard the future of science before it is corrupted.

★ Innovation 2026

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 an app or a paper guide?

Neither. Everything plays in your browser (Safari, Chrome) after you tap your activation link. No PDF to print, no download. The trail lives in your phone, that's it.

Q02How far do you walk in Old Town of Geneva, Switzerland?

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 play Geneva Old Town — The CERN Affair as a couple?

Great two-person format. Narration is dramatic without overdoing it, puzzles are designed to spark conversation. Ideal for new relationships or anniversaries — you discover the city and coordinate on puzzles simultaneously.

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, Old Town of Geneva, Switzerland is less crowded, and the light is better for camera clues.

Avis des aventuriers

Soyez le premier à partager votre expérience.

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Your turn to play

Delve into the secrets of Geneva, city of the Reformation and crossroads of nations, where every stone whispers the history of fierce independence.

12€
1 phone
23€
2 phones
33€
3 phones
42€
4 phones
50€
5 phones
56€
6 phones
62€
7 phones
68€
8 phones
74€
9 phones
80€
10 phones

1 purchase = 1 phone. Play several on the same device.

🕒No date to pick · Code valid 1 year · Play whenever you want
Get my code · 12€

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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