Trier — Secret of the Porta Nigra
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Trier, Rhineland-PalatinateTrier — Secret of the Porta Nigra
📍 Trier, Rhineland-Palatinate·🕐 2h – 2h30·📍 ~2.5 km
Also available as:HistoricalMysterySupernaturalFantasy

Trier — Secret of the Porta Nigra

Uncover the hidden conspiracy behind the Porta Nigra's construction in Roman Trier. Decipher ancient clues across 8 landmarks to expose a traitor's plot that threatened Augusta Treverorum.[1][2]

📱 1 to 10 phones · 1 team per phone · Independent codes

Difficulty
·From age 10 years
Starting point :In front of the Porta Nigra

In 170 AD, as Roman engineers erected the mighty Porta Nigra—the northern gateway to Augusta Treverorum—a shadowy conspiracy unfolded

8
stages
~2.5 km
route
2h – 2h30
at your pace
🚶
walking

Trier — Secret of the Porta Nigra

🎭Your Mission

You are Abbot Simeon, the 11th-century hermit monk who journeyed from Syracuse to settle in Trier.

Your mission: decipher the forgotten legends surrounding the Porta Nigra and its surroundings. Over

Step through the ancient arches of the Porta Nigra and unravel the mysteries of Augusta Treverorum, Roman Trier, with an augmented reality escape game.

Far more than an escape game

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.

🏛️
Hidden historical gems

At each stop, places ordinary guides miss — secret façades, sculpted crests, alleys steeped in history.

📜
Anecdotes & legends

Every riddle is rooted in a real historical fact or local legend. You leave with dozens of stories to tell.

🏗️
Architecture & heritage

Learn to read buildings — flamboyant Gothic, Baroque, Art Deco — like a real art historian, while having fun.

🚶‍♀️
Immersive wandering

Walk through the city like a novel's character — every alley becomes a stage, every square a theatre.

🎙️
Immersive audio narration

A voice walks with you at every step, tells the story of each place, reads clues, adds a cinematic feel.

📲
Yours forever

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?

🏛️
Outdoor escape game

Explore the city on foot solving puzzles based on real historical facts. No locked room — the city is your playground.

📱
On your smartphone

No app to download. Play directly from your browser. Guided step by step, at your own pace.

👨‍👩‍👧‍👦
Unlimited players

One purchase per phone is enough. Play with family, friends or as a couple — everyone participates.

🎯
Augmented reality

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.

🤖
AI that helps you

Stuck? Progressive personalised hints. The character repeats the puzzle on demand — at your own pace.

🗣️
32 languages

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

Rheinisches Landesmuseum Trieroptional
€12. Explore one of Germany's most important archaeological collections on the Roman and medieval history of Trier.
Optionnel
/pers.
Karl Marx Houseoptional
€5. Visit Karl Marx's birthplace, now a museum, to learn about his life and philosophical work.
Optionnel
/pers.
Moselle Wine Tastingoptional
From €15. Savor Riesling and Elbling grape varieties in a traditional winery along the Moselle, a few kilometers from Trier.
Optionnel
/pers.
Moselle River Cruiseoptional
€20. Enjoy panoramic views of vineyards and castles from the waters of the Moselle, departing from Trier's port.
Optionnel
/pers.
Budget if you do them all / pers.~0

The story that haunts this land

Your quest begins in front of the Porta Nigra in Trier, this colossal Roman gate built around 180-200 AD as the northern entrance to Augusta Treverorum. A UNESCO World Heritage site since 1986, its 117 meters in length and 30 meters in height, crafted from grey sandstone, testify to Roman power. In the 11th century, Archbishop Poppo of Trier transformed it into a church, then a double church in the 12th century, before Napoleon restored it in 1804, giving it its name 'Black Gate'. Here, you unlock the first clues about the architectural transformations that have marked this historic monument of Rheinland-Pfalz.

Continue to the Hauptmarkt, Trier's historic central square since the Middle Ages, where weekly markets have been held since the 13th century. At its center, the Market Cross (Marktkreuz), erected in 958 by Archbishop Egbert, symbolizes the city's autonomy. The 1590 Pestilence-Brunnen fountain recalls the health challenges of the era. On this bustling square, surrounded by Renaissance gabled houses, you'll discover the influence of trade and religious congregations on the urban development of Trier, a city with a rich heritage.

A short walk away, the Dreikönigenhaus, built in 1230, stands as Germany's oldest patrician house. Its late Gothic facade, adorned with statues of the Three Kings, reaches 18 meters in height. Acquired by the city in 1925, it now houses the Trier City Museum. This monument, listed as a historic landmark, illustrates the prosperity of medieval merchants in Trier. The Simeonstift, a Benedictine monastery founded in 1028 by Abbot Simeon, adjacent to the Porta Nigra, with its abbey church built between 1030 and 1080, completes this medieval picture, housing Simeon's tomb, who died in 1035.

Your itinerary then leads you to the Römerbrücke, a Roman bridge built around 144-150 AD and still in use over the Moselle. 310 meters long with 13 preserved arches, it was a vital artery for river traffic until the 20th century. Its fortified tower, added in the Middle Ages, testifies to its strategic importance. About 1 km from the Porta Nigra, this bridge, restored in 1972, is one of Germany's oldest. Further on, the Barbarathermen, Roman public baths spanning 4 hectares with walls up to 13.5 meters high and a 70x30 meter natatio, illustrate Roman engineering and leisure of the era in Trier.

Finally, the Trierer Dom, St. Peter's Cathedral, Germany's oldest cathedral, whose original basilica dates back to 320 AD under Constantine, concludes your exploration. Its 112-meter main tower, completed in the 13th century, houses the Holy Tunic of Christ. Inscribed as a UNESCO World Heritage site in 1986, it is a pillar of Trier's UNESCO Roman Monuments. This circuit will have allowed you to relive millennia of history, from Roman emperors to medieval archbishops, and will have revealed the heritage of Rheinland-Pfalz, an unforgettable experience to discover Trier with family or friends.

16 av. J.-C.
Foundation of Augusta Treverorum by Emperor Augustus.
180 ap. J.-C.
Completion of the Porta Nigra, largest Roman gate north of the Alps.
310 ap. J.-C.
Emperor Constantine the Great establishes his residence in Trier.

The Route

8 stages through the city

The gameplay: AR, camera, hidden clues

📱Search clues with your cameraRA

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.

8
original puzzles
24
min of narration
🪙 24
TripCoins granted
16
GPS waypoints

How does it work with a group?

One phone = one team. Pick the number at checkout (1 to 10).

🧍
1 phone

Solo, or a group sharing the screen. One team, one code.

👥
2-3 phones

Family, couple, or 2-3 teams competing. Each phone has its own code and its own score.

👨‍👩‍👧‍👦
4 to 10 phones

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.
🕒No date to pick · Code valid 1 year · Play whenever you want

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

Starting point
In front of the Porta Nigra
Directions on Google Maps
🕐
Duration
2h – 2h30
At your own pace
👥
Players
Unlimited
From age 10
📍
Distance
~2.5 km
Trier historic center
Accessibility
Partial
Some cobblestones and pedestrian streets
🌐
Languages
17 languages
Built-in translation

Why this route?

🧱

Ancient Architecture

Explore Trier's exceptional Roman remains, from the sandstone of the Porta Nigra to the foundations of the basilicas.

📜

Secret Inscriptions

Decipher symbols and marks left by Roman builders, hidden in plain sight.

🏛️

Time Travel

Relive the grandeur of Augusta Treverorum, one of the capitals of the Roman Empire.

The stone whispers ancient secrets.

Decipher the city's original plan.

★ Innovation 2026

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

Step through the ancient arches of the Porta Nigra and unravel the mysteries of Augusta Treverorum, Roman Trier, with an augmented reality escape game.

12€
1 phone
23€
2 phones
33€
3 phones
42€
4 phones
50€
5 phones
56€
6 phones
62€
7 phones
68€
8 phones
74€
9 phones
80€
10 phones

1 purchase = 1 phone. Play several on the same device.

🕒No date to pick · Code valid 1 year · Play whenever you want
Get my code · 12€

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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