Kepler's Heresy — Decode the Cosmic Conspiracy in Graz
Decipher Kepler's hidden notes scattered across Graz to expose the astronomical truths he dared not publish. Uncover the conspiracy that nearly destroyed his career.
📱 1 to 10 phones · 1 team per phone · Independent codes
In 1594, Johannes Kepler arrived in Graz as a young mathematics teacher, harboring dangerous ideas about the cosmos
Kepler's Heresy — Decode the Cosmic Conspiracy in Graz
You are Johannes Kepler's trusted assistant, tasked with a clandestine mission in Graz, the capital of Styria, in 1599.
You arrive at Hauptplatz, the first stop of
Dive into Johannes Kepler's secret investigation in Graz, where the revolutionary astronomer defied the Inquisition between 1594 and 1600.
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 story that haunts this land
Graz welcomes Johannes Kepler in 1594 as mathematics professor at the Protestant seminary of Styria. The classicist Town Hall, built between 1807 and 1809 by Domenico Sciassia on the medieval Hauptplatz, marks your starting point. Its 58-meter tower has dominated the UNESCO historic center since 1893, witness to the scientific revolutions that shook this central square. Here Kepler publishes in 1596 his Mysterium Cosmographicum, first attempt at geometric explanation of the solar system — a work that earned him Tycho Brahe's attention and the Catholic Church's hostility.
The Renaissance Landhaus, seat of Styria's government since 1565, hides in its arcaded courtyard the secrets of Archduke John, protector of sciences. Built by Domenico dell'Aglio between 1557 and 1565, this Herrengasse palace becomes Kepler's intellectual refuge against the rising Counter-Reformation. The astronomer finds here the patrons necessary for his research on elliptical orbits, theory that will revolutionize astronomy but endanger his life. The two-story arcades still echo with theological debates opposing science and dogma.
Saint-Giles Gothic cathedral, built between 1438 and 1464, preserves in its 24-meter nave the Renaissance frescoes witnessing the plague epidemic. These 15th-century paintings recall the superstitions Kepler fights through precise astronomical calculations. Former castle chapel transformed into cathedral in 1786, it symbolizes religious transformations accompanying scientific discoveries. Within these walls the astronomer meditates on celestial spheres' harmony, seeking in divine geometry a reconciliation between faith and reason.
Emperor Ferdinand II's Baroque mausoleum, erected between 1614 and 1638 by Pierre de Pomis, raises its 37-meter dome as a challenge to Keplerian theories. Ferdinand II, Counter-Reformation champion born in 1578, embodies the religious authority Kepler must circumvent to publish his works. The monument's Baroque style, adjacent to the cathedral, marks Catholic power's peak in Styria — when the astronomer must leave Graz in 1600, chased by the Inquisition but carrying the foundations of his future planetary laws.
Your journey through Sporgasse's medieval alleys and under Schlossberg's 1905 carillon reveals a secret Graz, that of persecuted scholars and hidden discoveries. The 1875 Stadtpark and Domherrenhof testify to the scientific legacy Kepler leaves to Styria: a rigorous method of cosmic observation that will triumph over dogmas. By decoding this cosmic conspiracy, you understand how a 29-year-old mathematician laid in Graz the foundations of modern astronomy, forever transforming our vision of the universe.
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?
Forgotten Manuscript
Piece together Kepler's hidden notes to reveal the truth.
Astrology and Superstition
Navigate between emerging science and popular beliefs.
Fight for Justice
Defend a family's honor against an unjust accusation.
Science against obscurantism, truth against fear.
Johannes Kepler, his mother's defender.
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.
Avis des aventuriers
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Your turn to play
Dive into Johannes Kepler's secret investigation in Graz, where the revolutionary astronomer defied the Inquisition between 1594 and 1600.
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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