🕒 No date to pick · Code valid 1 year · Play whenever you want
Get my code
Uncover the clandestine WWII plot in Venlo where sauerkraut shipments hid Nazi codes. Decipher clues across historic landmarks to expose the espionage ring before it's too late.
📱 1 to 10 phones · 1 team per phone · Independent codes
In the shadowed alleys of Venlo's historic center during World War II, a daring espionage plot unfolded
You are Jan Vermeulen, a Limburg Resistance liaison agent on a secret mission in occupied Venlo, October 1944.
You arrive at Stadhuis Square just days before the city
Follow the traces of Limburg resistance fighters who hid messages in the bricks of Venlo's Stadhuis, transforming this border town into a theater of espionage between 1940 and 1945.
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
« God en de Stad »— Motto of the city of Venlo
Venlo's Stadhuis, built in 1597 as the house of Saint Sebastian's archers then transformed into city hall in 1673, becomes your first contact with the Resistance. Its Renaissance stepped gable, typical of the southern Netherlands, hides within its 500 m² the municipal archives that resisters consulted to establish false papers. Damaged by fire in 1944 during World War II then restored in 1950, this building witnesses the violence of the final months of occupation. Behind its brick walls, you discover how Limburg officials discreetly sabotaged German administration.
Maasboulevard leads you along the Meuse for 1.2 km on a promenade developed in the 1970s, but which keeps the memory of the 1930 railway bridge. Bombed in 1940 and rebuilt in 1947, this bridge was a major strategic objective to cut German communications to the Netherlands. Since 2015, the area has been protected against floods with reinforced dikes, but in 1944, resisters used the banks to clandestinely smuggle escapees toward liberated Belgium. Each meander of the Meuse hid an escape route.
Sint-Martinuskerk raises its 75-meter Gothic tower in the heart of Venlo since its construction between 1350 and 1550. Pillaged by the French in 1794 during the Batavian Revolution, it preserves a 17th-century organ and stained glass windows dating from 1520-1530 that serve as landmarks for secret agents. In this church, priest Johannes van der Berg celebrates clandestine masses for resisters and hides weapons in the rood loft. Confessionals become secret mailboxes where messages to London transit. Every stone of this Gothic church heard the prayers of Limburg patriots.
Oude Markt, the central historic square since the 13th century and site of weekly markets since 1225, becomes the theater of gatherings during Venlo's liberation in 1944-1945. Surrounded by gabled houses from the 16th-18th centuries across its 2 hectares, this square sees the last German patrols and first Allied tanks parade. Limburg merchants hide radio sets in their vaulted cellars, transforming each shop into a BBC relay. Thursday's market becomes a pretext for exchanging vital information to prepare the final offensive.
Your mission ends at Julianapark, a public park created in 1903 over 8 hectares with lake and kiosk, planted with 5,000 trees and concert venue since 1920. Occupied by Germans from 1940-1944, it was liberated in October 1944 amid general euphoria. Under its foliage, you measure the path traveled from the first resistance cells to Venlo's liberation. Each path in this centennial park reminds you that the daily heroism of Limburgers contributed to writing one of the noblest pages in Dutch history. You leave with the certainty that ordinary courage can change the course of History.
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.
🔒 Secure payment · Code in 5 min · Free cancellation
Unravel the mysteries of an architect's plan modified by secret services.
Explore Venlo under the grip of World War II and its stakes.
Untangle the threads of a deception operation aimed at sowing chaos.
Unveil Venlo's Secrets
A Renaissance Legacy, a Wartime Plot.
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.
Soyez le premier à partager votre expérience.
Did you play l intrigue de sauerkraut? Check the email you received after your game to leave a verified review.
Follow the traces of Limburg resistance fighters who hid messages in the bricks of Venlo's Stadhuis, transforming this border town into a theater of espionage between 1940 and 1945.
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
More destinations, tours & urban treasure hunts across the country
Where history meets European charm
Historic canals and the majestic Dom Tower
Bold architecture and a giant port
Historic canals, art, and freedom: the Venice of the North awaits.
Blue pottery, picturesque canals, and Vermeer's timeless art.
Rembrandt's birthplace, historic university city
Coupe-file disponibles pour les sites payants de votre parcours. Gagnez du temps, vivez l'aventure pleinement.
8€. Collections d'art limbourgeois et d'archéologie locale dans un ancien couvent du XVIe siècle.
15€. Château baroque de 1653 avec jardins thématiques et roseraie de 3 000 variétés à 8 km de Venlo.
12€. Tarte traditionnelle limbourgeoise aux fruits de saison chez Bakkerij Coolen, institution locale depuis 1923.
18€. Bateau panoramique de 2h vers les écluses de Belfeld avec vue sur les vestiges du pont ferroviaire de 1930.
💡 Réservation optionnelle — vous pouvez aussi acheter sur place. Tous les liens ouvrent dans une nouvelle fenêtre, votre visite OddballTrip reste préservée.