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Uncover the medieval plot that hid the lost seals of Zierikzee, threatening the Hanseatic League's rise. Decode clues across ancient towers and streets to expose the traitors before their secret dooms the town forever.
📱 1 to 10 phones · 1 team per phone · Independent codes
In the shadowed heart of Zierikzee, during the turbulent 14th century, the powerful Hanseatic League plotted its dominance over Baltic trade
You are a trusted archivist in the service of Willem van Borssele, Lord of Zierikzee, in the late 15th century.
Your urgent task is to recover lost diplomatic seals,
Immerse yourself in the maritime secrets of Zierikzee, where ancient alleys and 17th-century facades still whisper the story of the Conspiracy of the Lost Seals.
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 quest begins on Havenplein, the historic harbor square in the heart of Zierikzee. Surrounded by 17th-century buildings, typical of Zeeland architecture, this square was a central point for trade. It was here that ships unloaded their goods, and rumors from distant ports spread. Look for the marks of ancient merchants on the cobblestones; they might guide you to the first clue of the missing seals. The ornate facades of the houses bear witness to the past wealth of this Dutch city.
The investigation then leads you to the Oude Haven, the old port dating back to the Middle Ages, which was Zierikzee's main maritime access until the 17th century. This port provided a direct link to the Oosterschelde, vital for the city's medieval trade. Lined with gabled houses from the 16th and 17th centuries, all classified as historic monuments, this site is a living testament to intense port activity. Perhaps in the captains' registers, you will find the key to the betrayal that led to the loss of the seals.
The Stadhuis van Zierikzee, built in 1554 in Dutch Renaissance style, is your next stop. Its facade is adorned with sculptures and coats of arms of the Lords of Zierikzee, and its tower rises to 42 meters. Classified as a Rijksmonument since 1969, this edifice has seen generations of magistrates and notables pass through. The municipal archives it houses could contain crucial information about the trade agreements and political plots of Willem van Borssele's era, revealing the fate of the seals.
Your journey takes you to the foot of the Sint-Lievensmonstertoren, nicknamed the 'Dikke Toren'. This unfinished bell tower of the Sint-Lievenskerk collegiate church, begun around 1454 by Adriaan van Bergen, bishop linked to its construction, dominates Zierikzee at 130 meters. The initial project aimed for 200 meters but was abandoned in 1511. A symbol of Zierikzee and classified as a national monument, this tower has witnessed the city's evolution. Its stones may hold messages carved by masons of old, revealing the hiding place of the items you seek.
The Noordhavenpoort, a city gate built in 1515, is the former northern entrance to the medieval fortification. In late Gothic style, with its machicolations and original drawbridge, it was restored in 1985 and is classified as a Rijksmonument. After passing through this gate, you will reach Molen De Hoop, the last active mill in Zierikzee, built in 1736. Standing 25 meters tall, it retains its original millstones dating from 1850. This thematic circuit through Zeeland's heritage will have allowed you to trace the history of Zierikzee, from its medieval trade to its emblematic monuments, and to thwart the Conspiracy of the Lost Seals.
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.
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.
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Dive into the secrets of medieval charters and agreements that sealed Zierikzee's destiny.
Explore the remnants of Zeeland's golden age of trade, where sea routes were vital.
Admire the gates and ramparts that protected the city from invasions and comital ambitions.
Untangle the web of comital and merchant intrigues!
The fate of Zierikzee is in your hands.
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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Immerse yourself in the maritime secrets of Zierikzee, where ancient alleys and 17th-century facades still whisper the story of the Conspiracy of the Lost Seals.
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
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Coupe-file disponibles pour les sites payants de votre parcours. Gagnez du temps, vivez l'aventure pleinement.
12€. Explorez les collections dédiées à l'histoire navale et commerciale de Zierikzee, y compris des maquettes de navires et des cartes anciennes.
5€. Montez les 280 marches du 'Dikke Toren' pour une vue panoramique sur Zierikzee et l'Oosterschelde, un Rijksmonument emblématique.
25€. Savourez les huîtres fraîches de l'Oosterschelde, réputées pour leur qualité, dans l'un des restaurants du port de Zierikzee.
Location de vélo 15€. Explorez les paysages côtiers de Zeeland et les villages pittoresques autour de Zierikzee.
💡 Réservation optionnelle — vous pouvez aussi acheter sur place. Tous les liens ouvrent dans une nouvelle fenêtre, votre visite OddballTrip reste préservée.