The Eleven Cipher — Decode Solothurn's Diplomatic Secret
Decipher a hidden code woven into Solothurn's baroque architecture. The number 11 conceals a centuries-old diplomatic conspiracy. Uncover the truth before the secret dies with the city.
📱 1 to 10 phones · 1 team per phone · Independent codes
For nearly 300 years, Solothurn harbored France's most sensitive embassy on Swiss soil (1530–1792)
The Eleven Cipher — Decode Solothurn's Diplomatic Secret
You are Nicolas de Flogny, French ambassador on a secret mission in Solothurn, 1765.
You arrive at the Ambassadorenhof, French diplomatic residence since 1
Uncover the mystery of the number 11 that haunts every stone, fountain, and bell tower in Solothurn since 1481.
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
Solothurn becomes the eleventh Swiss canton in 1481, thus sealing its destiny with this mystical number. Saint-Ours and Saint-Victor cathedral, built between 1762 and 1767 by Gaetano Matteo Pisoni, displays 11 bells in its 54-meter baroque bell tower. Its 11 interior altars are no coincidence: they materialize the city's symbolic position in the Confederation. Every stone of this white facade proclaims Solothurn identity, forged in the 15th-century Helvetic alliance.
The Ambassadorenhof reveals the second part of the mystery: built in 1750 to host French ambassadors, this baroque hotel has exactly 11 windows on the first floor. French property until 1798, it centralizes diplomatic intrigues of the Helvetic period. Nicolas de Flogny weaves his networks there between 1750 and 1770, transforming Solothurn into the unofficial capital of Franco-Swiss relations. The 11 windows are not architectural chance: they signal to initiates the particular rank of this residence.
The Zytglogge, 14th-century watchtower transformed into a belfry, reveals its 11 dials on the main facade. Its 1534 astronomical clock mechanism symbolizes communal control over time since 1376. Each dial tells a facet of Solothurn power: municipal, cantonal, confederate. This tower crowns an urban system where the number 11 has structured public space since the Renaissance.
The Jesuit church, built between 1679 and 1685 by Francesco Borromini, aligns 11 apostle statues on its main facade. The adjacent Jesuit college, founded in 1574, trains the diplomatic elite who will later negotiate with Versailles. The Krummturm, remnant of 14th-century fortifications, preserves 11 crenellations on its upper part. The Baseltor, last of the 11 medieval gates built in 1530, closes the city's defensive system. Even the Aarebrücke, rebuilt in 1798, counts 11 stone arches over its 120 meters.
On Marktplatz, commercial heart since the 13th century, 11 baroque fountains from the 18th century frame the town hall built by Johann Jakob Holzhalb between 1731 and 1734. This route reveals the key to the Solothurn mystery: the number 11 is not superstition, but political signature. Each monument proclaims belonging to the eleventh canton, each architectural detail claims an identity forged in 1481. You leave with the certainty that in Solothurn, history is written in numbers, and diplomacy passes through stones.
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?
Secret Diplomacy
Delve into the behind-the-scenes of 17th-century Franco-Swiss negotiations.
Baroque Architecture
Explore the architectural gems that shaped Solothurn's identity.
The Number Eleven
Unravel the mysteries hidden behind Solothurn's obsession with the number 11.
The secret of alliances hides within numbers.
Decipher Ambassador Bassompierre's lost formula.
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.
Avis des aventuriers
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Your turn to play
Uncover the mystery of the number 11 that haunts every stone, fountain, and bell tower in Solothurn since 1481.
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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