The Stone Frog
The facade of a thousand secrets of Spain's oldest university
📱 1 to 10 phones · 1 team per phone · Independent codes
On the Plateresque facade of the University of Salamanca, a tiny frog perched on a skull waits to be found. Legend says that whoever spots it without help will pass all their exams. But the frog is just the beginning.
Eight centuries of knowledge, one frog to guard them
Founded in 1218, the University of Salamanca is the oldest in Spain and one of the oldest in Europe. Its Plateresque facade, sculpted in 1534, is a stone puzzle: kings, popes, ancient heroes and hidden symbols mingle in an ornamental profusion that rewards the patient eye. The frog is just its most famous detail.
A game, a guided tour and a city guide — all in one
You're not just buying an escape game. You're carrying a living city guide — historical anecdotes, forgotten legends, key monuments, hidden architecture — unfolding step by step as you walk.
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.
Want to go deeper?
Places tied to your adventure — optional entries, totally up to you · per person
« "What nature refuses to teach, Salamanca provides." »— — Traditional Spanish proverb
The university that changed the world
Founded by King Alfonso IX of León in 1218, the University of Salamanca quickly became one of the four great centres of European learning, alongside Bologna, Oxford and Paris. It was here that Francisco de Vitoria laid the foundations of international law, that Antonio de Nebrija wrote the first grammar of a modern European language, and that 16th-century mathematicians calculated the reform of the Gregorian calendar.
The Plateresque facade, commissioned in 1534, is an iconographic programme of dizzying richness. At the centre, the medallion of the Catholic Monarchs. Above, the coat of arms of Charles V. And everywhere, skulls, mythological figures, Venuses and heroes — a humanist manifesto carved in Villamayor stone.
The frog — rana in Spanish — perches on a skull to the right of the portal. It symbolises the sin of lust that awaits the careless student. But for Salamanca's students, it has become a talisman: finding it without help guarantees exam success. For five centuries, thousands of eyes have scrutinised the facade every day.
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?
The frog hunt
Salamanca's most famous tradition — finding the rana on the facade — is integrated into the game.
Historic university
Visit one of the oldest and most prestigious universities in the Western world.
Golden stone
Salamanca is the "golden city" — Villamayor stone takes on a golden hue at sunset.
100% accessible
Flat route through the historic centre — wheelchair and pushchair accessible.
The frog only shows itself to those who know how to look.
Find the frog. Find the knowledge.
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, WhatsApp, 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.
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Your turn to play
From the hidden frog to the golden Plaza Mayor — an escape game in the most beautiful university city in the world.
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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