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Uncover the conspiracy of the 'Frozen Lines'—coded messages hidden in Seosomun's execution grounds during the Cold War. Decode the secrets before they vanish forever.
📱 1 to 10 phones · 1 team per phone · Independent codes
In the shadowy heart of 1950s Seoul, amid the ruins of Seosomun execution ground where thousands met their fate under authoritarian rule, a clandestine network of spies etched the 'Frozen Lines'—indel
You are a Joseon court royal secretary on a diplomatic mission in 15th-century Seoul.
Your mission leads you 1.5 km from King Sejong's statue to
Dive into Seoul's millennial soul, where Joseon palaces meet modern embassies and every stone tells 600 years of dynastic history.
Your investigation begins before the statue of King Sejong the Great, erected in 1973 by sculptor Kim Young-won on Gwanghwamun Square. This 6.1-meter monument honors the creator of hangul in 1443, the writing system that revolutionized cultural access for the Korean people. Inscriptions carved in hangul and classical Chinese on the base witness this major linguistic transition. Sejong (1397-1450) embodies the Confucian golden age of the Joseon dynasty, when Seoul became the intellectual center of the peninsula. This 40,000 m² square, inaugurated in 2009, marks the convergence point of historic axes Jongno-ro and Sejongno.
Your route then leads to the US Embassy, a 1970 modernist building located 800 meters from Gwanghwamun. This 7-story architecture, surrounded by security walls reinforced since 2002, symbolizes Korea's entry into modern world geopolitics. The striking contrast with surrounding Joseon palaces illustrates Seoul's 20th-century transformations. Accessible via Jongno 3-ga station (metro line 1), this geopolitical landmark reminds you that your diplomatic mission follows historical continuity: Seoul has always been a crossroads of influences, from 15th-century Ming embassies to contemporary diplomatic representations.
Gwanghwamun gate of Gyeongbokgung Palace reveals the scope of your investigation field. Originally built in 1395 under Yi Seong-gye, founder of the Joseon dynasty, this 430,000 m² enclosure was almost totally destroyed in 1910 during Japanese annexation. The major 1990-2010 reconstruction revived Korea's largest royal palace, after the 2008 criminal fire that ravaged the main gate. The Palace Museum preserves 40,000 historical artifacts including royal robes, musical instruments and official documents you're seeking. This monumental restoration testifies to Korean determination to preserve dynastic memory against 20th-century traumas.
Your investigation continues through Insadong alleys, a 1.2 km linear historic quarter that was the commercial axis of the Joseon period from 14th to 19th centuries. The 110 art galleries and antique dealers of Insadong-gil might harbor clues about your missing document. Hanok houses with wood and tile structures, characteristic curved roofs, have crossed centuries preserving their traditional architecture. The underground Ssamziegil market, opened in 2004 with 70 shops across 5 floors, perpetuates this millennial commercial tradition. Here, merchants and artisans jealously guard secrets of private collections that escaped 1910 destructions.
Your mission concludes at Jongmyo shrine, founded in 1395 and inscribed as UNESCO World Heritage in 1995. This Confucian temple dedicated to Joseon ancestors preserves 19 royal tablets in sacred altars, within the 101-meter-long main building Jeongjeon. The nail-free wooden structure illustrates Korean architectural genius you've followed since Gyeongbokgung. The annual Jongmyo Jerye ceremony, recognized as UNESCO Intangible Cultural Heritage in 2001, perpetuates rituals your predecessor royal secretaries organized six centuries ago. You leave Seoul certain that the Joseon dynasty's soul still beats in every stone, every curved roof, every hangul character of this millennial capital.
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
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.
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Infiltrate spy networks and follow the trail of a key informant.
Decipher the secrets that led to the stalemate and permanent division.
Thwart a conspiracy by assembling the pieces of a coded architectural plan.
Truth is the first casualty of war.
Aeschylus
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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Dive into Seoul's millennial soul, where Joseon palaces meet modern embassies and every stone tells 600 years of dynastic history.
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 ideas for self-guided walking tours, scavenger hunts & city quests in the same city

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Decipher the hidden Cold War secrets buried in Seoul's heart. Trace the armistice conspiracy that split a nation and uncover the truth behind the division.

Decipher the hidden network of Korean independence fighters imprisoned in Seodaemun Penitentiary during Japanese occupation. Uncover the coded messages and expose the truth behind their defiant pledge.
More destinations, tours & urban treasure hunts across the country
Coupe-file disponibles pour les sites payants de votre parcours. Gagnez du temps, vivez l'aventure pleinement.
3000 KRW. Explorez les 430 000 m² du plus grand palais royal de Corée avec ses 40 000 artefacts historiques et la cérémonie de la garde royale.
8000 KRW. Savourez le thé traditionnel coréen dans une maison hanok authentique du 17ème siècle transformée en salon de thé.
Gratuit. Découvrez les 900 maisons hanok illuminées du quartier résidentiel traditionnel préservé depuis les années 1930.
1000 KRW. Assistez aux rituels confucéens millénaires dans ce site UNESCO où reposent 19 tablettes royales de la dynastie Joseon.
💡 Réservation optionnelle — vous pouvez aussi acheter sur place. Tous les liens ouvrent dans une nouvelle fenêtre, votre visite OddballTrip reste préservée.