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Under Amersfoort's ancient walls, decipher hidden Resistance messages etched in medieval stones. Uncover the secret network that defied the Nazis—solve the code before it's lost forever.
📱 1 to 10 phones · 1 team per phone · Independent codes
In the shadowed Muurhuizen district of Amersfoort, where 14th-century walls were repurposed into charming houses, a clandestine Resistance network operated under Nazi occupation
You are Jan Dieters, coordinator of the 'Amersfoortse Ondergrondse' resistance network in 1943 Amersfoort.
Your mission: secure vital information and
Delve into the heart of Amersfoort, a medieval city in Utrecht, to outsmart the shadows of occupation and infiltrate the Wall's resistance network.
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. »
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.
Places tied to your adventure — optional entries, totally up to you · per person
Your journey begins at the Koppelpoort, this fortified city gate built in 1428, the last of Amersfoort's six medieval remnants. Standing 18 meters tall, it featured a drawbridge until the 17th century and was designated a Rijksmonument (number 7803) in 1967. During World War II, it became a crucial clandestine passage point for the local resistance network, allowing agents to discreetly move between the suburbs and the city center. It is here that the first clues are revealed, immersing you in the tense atmosphere of the occupation.
As you walk along the Muurhuizen, you traverse a unique circular street, formed by the medieval city walls demolished in 1450 and then rebuilt as brick gabled houses. Over 1.2 km, 200 historic facades from the 14th-16th centuries bear witness to Amersfoort's rich heritage. During the 1940-1945 occupation, these houses provided vital hiding places for the 'Amersfoortse Ondergrondse'. Restored in 1975 with support from the Fonds voor de Nederlandse cultuur, they are a tangible example of urban ingenuity and resilience in the face of the enemy, visible on the 1930 IGN map outlining the loop around the historic center.
The Plompetoren, a cylindrical watchtower 61 meters high, stands proudly. Built around 1370-1400 as part of Amersfoort's western rampart, it housed a 5-ton bell dated 1496, used for alarm signals until 1881. Designated Rijksmonument number 7804 and restored in 1952, it served as a strategic observation post for the resistance during World War II, monitoring German patrols. From its virtual battlements, you gain a panoramic view over 1.5 km, encompassing the Koppelpoort and the Muurhuizen, key points for your mission in the province of Utrecht.
Your route then leads you to the Sint-Joriskerk, a Gothic hall church built from 1421 to 1534, with a central nave 50 meters long. Its 92-meter bell tower, completed in 1607, houses 48 bells. This Rijksmonument (number 7806), whose stained-glass windows were restored in 1946 after war damage, was a site for secret meetings of the Amersfoort resistance network in 1943-1944. With its capacity for 1500 people and its historic 1755 organ by Christian Müller, the church served as an ideal cover for discreet exchanges under the nose of the occupier. Further on, the Monnikendam, a 14th-century river port on the Eem River, dug in 1381 for beer trade, became a crossing point for arms shipments via the Utrecht-Amersfoort resistance network during the war, its 17th-century stone quays restored in 2005 concealing old secrets.
Your journey concludes at the Dieventoren, the 'Thieves' Tower', built in 1418 and 30 meters high, an integral part of Amersfoort's Wall defense system. Used as a municipal prison until 1828, its 2x3 meter cells became, during the Nazi occupation, a temporary detention center for resistance fighters before deportation. This Rijksmonument (number 7805), structurally restored in 1982 for 1.2 million guilders, embodies the brutality of the era but also perseverance. Your Amersfoort mission will have taken you through history, from the Rijksmonumenten Nederland to the streets where the courage of the WOII Verzetsgeschiedenis Utrecht was written.
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.
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.
Ready to live this adventure?
Get my code · 12€No calendar booking. Code sent immediately by email.
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Discover Amersfoort's architectural treasures, from fortified gates to wall houses, witnesses to its rich past.
Dive into the heroic narratives of the Dutch Resistance during World War II.
Uncover secret codes and hidden messages left by past agents in unsuspected places.
Walls have ears, and secrets too.
Unveil the hidden courage of Amersfoort's resistance fighters.
OddballTrip combines gamified play, augmented reality and AI. All our competitors deliver 1 or 2 of these angles. We deliver all 5.
A golden chest floats in front of the monument. Tap → opening animation → reveals a secret message.
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.
At the puzzle climax, golden letters magically write themselves on the real wall — that's the puzzle answer. An unforgettable visual effect.
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.
A mini-radar shows the target even behind you, and the phone vibrates when you aim in the right direction.
Every puzzle weaves in real historical facts (architecture, era, anecdotes). You learn by playing — like a gamified audioguide.
3 levels of AI-generated help: vibe → where to look → answer format. You're never stuck.
At the end of the game, capture a selfie with OddballTrip banner + mascot, shareable on Instagram, TikTok.
PWA technology: open the link, it plays in your browser. Same quality as an app, no App Store hassle.
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.
GPS yes (handled by your phone). Maps yes (tiles cached). AI and hints need an intermittent 4G connection.
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.
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).
From 12 without an adult, from 6 with an adult reading puzzles. Works for families, couples, friend groups, companies.
Pre-register or contact us — we'll email you as soon as your city is live.
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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Delve into the heart of Amersfoort, a medieval city in Utrecht, to outsmart the shadows of occupation and infiltrate the Wall's resistance network.
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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Coupe-file disponibles pour les sites payants de votre parcours. Gagnez du temps, vivez l'aventure pleinement.
12,50€. Visitez la maison natale de Piet Mondrian et découvrez ses débuts artistiques avant le néoplasticisme, à seulement 10 minutes à pied des Muurhuizen.
10€. Explorez l'histoire d'Amersfoort, de la préhistoire à nos jours, dans un édifice datant de 1540, à quelques pas de la Sint-Joriskerk.
À partir de 5€. Savourez des bières artisanales néerlandaises dans une brasserie historique près du Monnikendam, perpétuant la tradition brassicole d'Amersfoort.
9,50€. Détendez-vous dans l'un des plus anciens jardins botaniques des Pays-Bas, abritant plus de 10 000 espèces végétales, à 20 minutes en transport depuis Amersfoort, idéal pour une journée dans la province d'Utrecht.
💡 Réservation optionnelle — vous pouvez aussi acheter sur place. Tous les liens ouvrent dans une nouvelle fenêtre, votre visite OddballTrip reste préservée.