Rotterdam — Erasmus's Hidden Truth
Uncover the suppressed secrets of Erasmus, Rotterdam's humanist prince. Decode clues hidden in landmarks to reveal a conspiracy that silenced his radical truths during the Reformation turmoil.
📱 1 to 10 phones · 1 team per phone · Independent codes
In the heart of Renaissance Rotterdam, Desiderius Erasmus, the city's most famous son, penned revolutionary ideas challenging Church dogma and imperial power
Rotterdam — Erasmus's Hidden Truth
You are Desiderius Erasmus, the humanist born in Rotterdam in 1466, returning to your hometown centuries later.
Your mission: decipher the clues the past has scattered to understand how
Delve into Rotterdam's cobbled streets where the spirit of Erasmus, the visionary humanist, still whispers the secrets of an eternally reborn city.
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.
Want to go deeper?
Places tied to your adventure — optional entries, totally up to you · per person
« I yield to none »— Desiderius Erasmus, Erasmus's personal motto, engraved on his portrait by Hans Holbein the Younger, 1523
The story that haunts this land
Your quest begins at Grotekerkplein, in front of the majestic Standbeeld van Erasmus. This 3.5-meter-high bronze statue, inaugurated in 1622 by Hendrick de Keyser the Younger, depicts Desiderius Erasmus seated with a book, commemorating the founding of his Latin school in 1481. Moved from its original location near the Boogjes de Bruggen in 1986, and restored in 1952 after World War II damage, it is the starting point of your exploration of Rotterdam's heritage and Zuid-Holland. Here, the first clues reveal the humanist aspirations of the great thinker.
Right next door stands the Grote of Sint-Laurenskerk, a Gothic church built between 1449 and 1525, with its 90-meter Gotfriedbombard tower completed in 1646. It is the only major remnant of the 1940 German bombing that destroyed 80% of Rotterdam's city center. Erasmus was baptized here in 1467, a fact that deeply anchors his history in these places. The 64-stop organ, installed in 1953 by Flentrop, still resonates with the city's resilience, a Rijksmonument classified in 1967 that invites you to decipher the symbols of reconstruction.
Your journey then leads you to the Witte Huis, an Art Nouveau skyscraper completed in 1898 by Jan Verheul. At 43 meters high and 10 stories tall, it was the first reinforced concrete building in the Netherlands, inspired by New York's Flatiron Building. This monument, restored in 1985-1986 for 8 million guilders after suffering damage in 1940, has been a Rijksmonument n°12158 since 1966. It embodies the vision of a modern Rotterdam, long before the adoption of the city's motto "Sterk door samenwerking" (Strong through cooperation), illustrating how innovation has always shaped Rotterdam's heritage.
Crossing the Wijnhavenbrug and walking along the Oude Haven, Rotterdam's oldest basin developed in 1350, you discover a historic port with 1.2 km of quays. Rebuilt after the 1940 fire, this site is marked by the installation of the first Dutch steam crane in 1807 and the departure of the Pilgrims for America in 1620 from the Speedwell. Classified as a municipal monument in 1978, Rotterdam's Oude Haven connects you to the city's maritime heritage and a history of departures and new foundations, a fundamental aspect of Rotterdam's industrial heritage in Zuid-Holland.
Your journey concludes at the Erasmusbrug, the 802-meter cable-stayed bridge inaugurated in 1996 by Queen Beatrix, with its 139-meter pylon. Nicknamed 'The Swan' for its shape, this bridge, named after Erasmus, cost 221 million guilders. It is crossed by 35,000 vehicles daily and symbolizes Rotterdam's connection to the world, a trait the humanist would have appreciated. This thematic circuit in Rotterdam has allowed you to understand how the city of Zuid-Holland, a member of the UNESCO Creative Cities Network for design, has managed to combine its rich past with a vision for the future, an interactive visit that reveals Erasmus's full truth through its monuments.
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?
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?
Humanist Legacy
Discover Erasmus's lasting influence and his fight for freedom of thought.
Hidden Truths
Uncover the secrets and coded messages left by the Prince of Humanists.
Dialogue & Dissent
Explore the places where new ideas flourished despite religious censorship.
A life without books is hell.
Unravel Erasmus's legacy to protect freedom of thought.
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.
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Your turn to play
Delve into Rotterdam's cobbled streets where the spirit of Erasmus, the visionary humanist, still whispers the secrets of an eternally reborn city.
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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