The Grimm Conspiracy — Decode the Brothers' Hidden Cipher
Decipher a coded manuscript hidden by the Brothers Grimm before their exile. Uncover the secret linguistic conspiracy embedded in their fairy tales and recover the lost key to their greatest discovery.
📱 1 to 10 phones · 1 team per phone · Independent codes
In 1837, Jacob and Wilhelm Grimm fled Kassel after refusing to swear allegiance to the new Hanoverian king
The Grimm Conspiracy — Decode the Brothers' Hidden Cipher
You are Jacob Grimm, the renowned philologist and storyteller, in Kassel, 1812.
Your mission: uncover a lost manuscript that could reveal an unexpected dimension of your famous Kinder
Dive into the heart of Kassel, city of the Grimm brothers, to decipher an ancient secret hidden in the tales that have marked generations.
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
« The tales of past times nourish the imagination of children and adults. »— Jacob Grimm, Preface to Kinder- und Hausmärchen, 1812
The story that haunts this land
Your quest begins at Grimmwelt Kassel, opened in 2015 on the foundations of Jacob Grimm's (1784-1863) former spinning mill. This museum, dedicated to the Grimm brothers and the UNESCO fairy tale heritage, displays over 2000 original objects. The 23-degree inclined architecture by Atelier ST pays homage to the 23 years the Grimms spent in Kassel. It is here, among the memories of the two philologists' lives, that the first clues are revealed, guiding you to the roots of their narratives.
Continue to the Staatstheater Kassel, a building erected between 1777 and 1779 under Landgrave Wilhelm IX of Hesse-Kassel. This baroque opera house, with a capacity of 850 seats, is the first of its kind to be preserved in mainland Germany. Its 7° inclined stage was a technical innovation to improve visibility. It is in this cultural hotspot of Kassel, where many works by Carl Maria von Weber were created, that you discover a coded message related to the performances that may have inspired popular tales.
Your journey then takes you to the Martinskirche in Kassel, a Gothic church built around 1320-1360. Its tower, restored after its destruction in 1943 and rebuilt between 1950 and 1958, rises to 76 meters. The crypt houses the tomb of Wilhelm IV of Hesse (1532-1592). This edifice possesses one of the largest preserved baroque organs in Hesse, and it is within its ancient walls that you decode a fragment of the mystery, perhaps linked to the city's motto, "Vorwärts mit Gott", etched in stone.
Brüder-Grimm-Platz, created in 1985 for the 200th anniversary of the Grimm brothers, is your next stop. The statue of the Grimm brothers, sculpted by Bernard Laban in 1985, dominates the square, formerly the site of the old library where the Grimms worked. It is a place for cultural gatherings related to the UNESCO fairy tale heritage, a crossroads where Kassel's literary past comes alive. Here, the silhouettes of the storytellers appear, inviting you to search for hidden symbols in the urban landscape.
Finally, your investigation leads you to Karlsaue Park, the largest baroque garden in Hesse, created between 1689 and 1726 under Charles of Hesse-Kassel, spanning 165 hectares. This historic garden, classified as a remarkable Karlsaue garden, contains the Orangerie (1710) and the Märchengarten, linked to the Grimms. It has been a site for Documenta festivals since 1696. The Orangerie, built between 1709 and 1711, housed 600 citrus trees thanks to a centralized heating system, and today hosts the Astronomy Museum. Your journey through Kassel, city of the Grimm brothers, reveals how their work is rooted in history, German literary heritage, and the landscapes of Hesse, offering a unique interactive visit. The secrets of the Bergpark Wilhelmshöhe UNESCO 2013 also resonate in this exploration of tales.
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?
Enchanting Tales
Rediscover the roots of fairy tales.
Inspiring Nature
Explore the landscapes that fed the Grimms' imagination.
Oral Traditions
Unravel the popular stories passed down through generations.
In every tale, a truth slumbers.
Uncover the mysteries of ancient legends.
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
Dive into the heart of Kassel, city of the Grimm brothers, to decipher an ancient secret hidden in the tales that have marked generations.
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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