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Uncover the KGB's hidden surveillance empire in Cold War Tallinn. Decipher coded messages, expose informant networks, and solve the mystery of Room 23 before the truth is erased.
📱 1 to 10 phones · 1 team per phone · Independent codes
During the Soviet occupation of Estonia, the Viru Hotel stood as a monument to socialist progress—a gleaming 22-story tower in the heart of Tallinn
You are an Estonian counter-intelligence agent in August 1991, amidst the USSR's collapse and the hasty abandonment of KGB posts in Tallinn.
Your mission: to document the evidence
Delve into the depths of Tallinn and decode the KGB's secrets, hidden on the 23rd floor of the Hotel Viru, a symbol of Soviet espionage.
« There is nothing here »— Inscription on the 23rd-floor door of Hotel Viru, Tallinn
Your investigation begins at the Sokos Hotel Viru in Tallinn, a building constructed in 1972 specifically to accommodate foreign visitors during the Soviet era. Officially, the hotel had only 22 floors, but for decades, the 23rd floor, hidden from public view, housed the secret KGB headquarters. Sixty hotel rooms contained hidden microphones, integrated into walls, telephones, and even bread plates. KGB agents monitored visitors' interactions, enforcing strict segregation between Soviet citizens and foreigners, assigned to different floors with staggered meal times to prevent unsupervised conversations. It was here that sensitive intelligence was transmitted directly to Moscow.
Continue your progress towards Vabaduse väljak, Freedom Square, located approximately 200 meters from the Hotel Viru. This site was a popular gathering point during the Estonian independence movements in the 1980s-1990s, symbolizing the nation's resilience in the face of Soviet occupation. The Estonian Monument of Liberty, erected to commemorate victories in the War of Independence, reflects the historical context of the USSR's collapse in August 1991, when KGB agents hastily abandoned their posts, leaving behind papers, broken equipment, and abandoned listening devices in the Viru building.
Exploring Tallinn's Old Town, a medieval quarter inscribed on the UNESCO World Heritage List in 1997, you walk through cobbled streets and ancient architecture that starkly contrasts with the Soviet modernism of the Hotel Viru. Streets like Suur-Karja tänav, where you pass number 15, are silent witnesses to the ages. This historic district, preserved since the Middle Ages, offers a multi-layered setting, where every stone could tell a story of occupation and resistance, before and after the Soviet period that Yuri Andropov, KGB director from 1967 to 1984, oversaw with an iron fist.
Your journey also takes you to sites like Kohtu tänav 4 and Pagari tänav 1, addresses that may have served as covers or surveillance points for intelligence services. Metsakalmistu, the Forest Cemetery, although distant from espionage intrigues, is a place of remembrance where many figures of Estonian history rest, including Lennart Meri, president of independent Estonia from 1992 to 2001. These places recall the depth and complexity of Tallinn's and the Harju region's history, marked by struggles for sovereignty and the preservation of national identity.
The culmination of your exploration is the Kiek in de Kök Kindlustustemuuseum, a 15th-century medieval defense tower. This Defense Museum, part of Tallinn's historic fortifications, traces military history and periods of occupation, offering a perspective on the long duration of conflicts that shaped Estonia. Understanding medieval defense strategies and earlier periods of occupation enriches your perception of the Soviet period and the KGB's role. This interactive visit allows you to connect Tallinn's ancient past with the dark legacy of the Cold War, an essential historical memory tourism for understanding Soviet heritage in Estonia and the espionage of that era, central themes of this historical escape game in Tallinn.
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.
🔒 Secure payment · Code in 5 min · Free cancellation
Discover the secret listening techniques used by the KGB in Eastern Europe's most surveilled hotel
Explore the hidden buildings and phantom floors of Soviet surveillance in Tallinn
Dive into the world of East-West espionage and encrypted communications to Moscow
Listen to History
In the walls of Tallinn
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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Delve into the depths of Tallinn and decode the KGB's secrets, hidden on the 23rd floor of the Hotel Viru, a symbol of Soviet espionage.
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

Uncover the secret ledger of the Drapers' Guild, hidden amid betrayal and conspiracy in Tallinn's Hanseatic heart. Decode clues across medieval landmarks to expose the thieves who sabotaged the merchants' trade empire.

Uncover the secret codes hidden in the Singing Revolution's patriotic songs. Decode whispers from clandestine rehearsals in Old Town ruins to expose the Soviet spies who infiltrated the choirs and threatened Estonia's independence.

Uncover the secret alliance between Danish conquerors and Teutonic Knights that founded Tallinn in 1219. Decipher their hidden pact amid medieval walls before a curse seals it forever.
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.
1€. Visitez le 23e étage de l'Hôtel Viru, transformé en musée en 1994, pour découvrir le quartier général secret du KGB avec sa salle radio et ses bureaux restés figés en 1991. Les visites guidées en anglais sont réservables en ligne.
15€. Explorez cette tour de défense médiévale du XVe siècle et ses passages souterrains pour une immersion dans l'histoire militaire de Tallinn et ses fortifications.
25-40€. Savourez des spécialités locales comme le 'verivorst' (boudin noir) ou le 'mulgikapsad' (choucroute avec de la viande) dans un restaurant de la Vieille Ville de Tallinn.
Gratuit (pourboire apprécié). Participez à une visite à pied pour découvrir les ruelles médiévales, les églises historiques et les places animées, classées au patrimoine mondial de l'UNESCO.
💡 Réservation optionnelle — vous pouvez aussi acheter sur place. Tous les liens ouvrent dans une nouvelle fenêtre, votre visite OddballTrip reste préservée.