Zagreb — Tesla's Lost Spark
Uncover the conspiracy that buried Nikola Tesla's revolutionary AC power plans in Zagreb. Decode plaques, statues, and hidden messages across Lower Town to reclaim the lost spark before it's erased forever.
📱 1 to 10 phones · 1 team per phone · Independent codes
In 1890s Zagreb, Nikola Tesla, the visionary son of this city, returned with blueprints for an alternating current power station that could electrify the world
Zagreb — Tesla's Lost Spark
You are a brilliant young electrical engineer, recently commissioned by the Croatian Academy of Sciences and Arts in 1946, to recover Nikola Tesla's lost plans.
Your mission: decipher the enig
Dive into the streets of Zagreb for an immersive quest tracing the footsteps of Nikola Tesla, the mind that lit up the world.
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
Your quest begins on Trg bana Josipa Jelačića, Zagreb's main square. Inaugurated in 1848 after the post-fire reconstruction of 1731, it is dominated by the equestrian statue of Ban Josip Jelačić, erected in 1866 by Ivan Meštrović. This 8-meter monument, removed in 1947 under the communist regime and reinstalled in 1990, symbolizes Croatian resilience. On this 20,000 m² surface, site of the 1991 independence demonstrations, you search for Tesla's first clues, the electrical pioneer who shook the scientific world.
Your journey then takes you to the Hrvatska akademija znanosti i umjetnosti, founded in 1866 by Ante Kuzmanić and Franjo Kuhač. Housed in 1880 in a Neo-Renaissance building by Hermann Bollé, this institution recognized Nikola Tesla as a corresponding member in 1915 for his scientific contributions. The 4-story building, with its 50-meter long facade, has housed a national library since 1885 with 500,000 volumes. It is here, among the accumulated knowledge, that one of Tesla's secrets might be hidden, linked to the advances Croatia has brought to progress.
Continue towards the Hrvatsko narodno kazalište u Zagrebu, the Croatian National Theatre, opened on October 29, 1895. This Neo-Renaissance building, designed by Ferdinand Fellner and Hermann Helmer, has a capacity of 850 seats and was the first stage in Croatia to use electricity for lighting in 1895, with an 18-meter wide stage. In 1895, it hosted operas by Ruggero Leoncavallo, marking the cultural boom post-1848 autonomy. This place of innovation and light, at the heart of Croatian cultural heritage, might hold a piece of Tesla's enigma, whose research revolutionized electrical distribution.
Your exploration leads you to the Tehnički muzej Nikola Tesla, opened in 1952 in the former Technical School building of 1882. This museum, dedicated to the inventor born in Smiljan, exhibits a collection including his 1892 two-way telegraph and high-voltage generators over a 1,200 m² exhibition area. Tesla is honored annually here since 1960 with scientific conferences. Here, in the heart of Zagreb, you will have to manipulate replicas of his inventions, and perhaps activate a hidden device to reveal the next step of your GPS treasure hunt.
Your journey concludes by ascending towards Zagreb's upper town, passing through Park Zrinjevac, with its 4,000 two-century-old plane trees, and Kamenita vrata, the only surviving medieval gate from 1266. Finally, the Kula Lotrščak, a fortified tower from 1242, with its cannon fired daily since 1877, offers panoramic views of the city. This walking tour of Zagreb will have taken you through centuries of history and progress, recalling the city's motto, "Ljudima i napretku" — To people and progress. You will have unraveled the threads of scientific and cultural history, enriching your interactive visit to Zagreb and immersing you in the legacy of Nikola Tesla, one of Croatia's listed monuments.
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?
Electrical Genius
Explore the mind of Nikola Tesla through his revolutionary concepts.
Forgotten Patent
Unveil the plot surrounding a crucial document, lost or stolen.
Historical Investigation
Lead a quest to rehabilitate a misunderstood inventor.
Restore the truth about Tesla's genius!
Thwart the conspiracies and give the inventor his rightful place.
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 streets of Zagreb for an immersive quest tracing the footsteps of Nikola Tesla, the mind that lit up the world.
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
Other escape games in Zagreb City Center
See all games in Zagreb City Center→More ideas for self-guided walking tours, scavenger hunts & city quests in the same city
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