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Decipher the Echo of Liberty: uncover a Revolutionary conspiracy surrounding the Liberty Bell's secret inscription and a vanished artifact that challenges the founding of freedom.
📱 1 to 10 phones · 1 team per phone · Independent codes
In the heart of Philadelphia's Independence National Historical Park, the Liberty Bell stands silent, its biblical inscription 'Proclaim Liberty Throughout All the Land' masking a darker truth
You are Thomas Jefferson, principal author of the Declaration of Independence, on July 4, 1776, in Philadelphia, Pennsylvania, as the future of the United States hangs in the balance.
Discover the beating heart of American democracy, where ideals of liberty were forged and etched into history.
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
« We hold these Truths to be self-evident, that all Men are created equal... »— Thomas Jefferson et al., Declaration of Independence, July 4, 1776
Your journey begins in front of the Liberty Bell Center in Philadelphia, where the echo of freedom resonates. Forged in 1752 by London's Whitechapel Foundry, the Liberty Bell, 3.3 feet high and weighing 2080 pounds, announced the first public reading of the Declaration of Independence on July 8, 1776. Its famous crack, which appeared during a test that same year, became a symbol of fragility and perseverance. The center, opened in 2003, protects this monument that attracts 3 to 5 million visitors annually to Independence National Historical Park, a UNESCO World Heritage Site since 1979.
A short walk away, Independence Hall, a National Historic Landmark, stands imposing. Built between 1732 and 1753 in Georgian style, this 105-foot long by 65-foot wide building was the scene of the adoption of the Declaration of Independence on July 4, 1776, and the signing of the Constitution in 1787. It is here, in Philadelphia, that Founding Fathers like Thomas Jefferson and John Adams drafted the nation's foundational documents. The old tower once housed the first American flag, testifying to the early history of Philadelphia.
Right next door, Congress Hall, completed in 1789, plunges you into the young republic. This red-brick building served as the United States Capitol from 1790 to 1800, accommodating up to 200 representatives and senators. It was within these walls that George Washington was elected for his second term in 1793 and John Adams was inaugurated president in 1797. This site, preserved since 1948, is an integral part of Philadelphia's heritage and the Independence National Historical Park, marking a crucial decade before the capital moved to Washington D.C. in 1800.
Your route then takes you to Washington Square Park, one of Philadelphia's five original public squares, founded in 1682. This approximately 4-hectare area with tree-lined paths served as a cemetery during the Revolutionary War and the yellow fever epidemic of 1793. The Tomb of the Unknown Soldier, erected in 1957 and adorned with an eternal flame lit since 1954, honors revolutionary soldiers. A block from Independence Hall, this square served as a camp for the Continental Army, a poignant testament to Philadelphia's role in the nation's founding.
Finally, your immersion in Philadelphia's history concludes with a deep understanding of what it means to be at the Birthplace of American Democracy. You have walked in the footsteps of George Washington and Benjamin Franklin, seen the places where decisions were made, and felt the spirit of a nascent nation. This thematic tour in Pennsylvania, a true GPS scavenger hunt, offers a unique perspective on Philadelphia's heritage. You take away not only factual knowledge but also a tangible connection to the ideals that shaped the United States.
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?
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Follow the echo of the Liberty Bell through historic streets.
Reconstruct an architectural map or a forgotten guild register.
Discover how the ideas of liberty were etched into the city.
Every step reveals an echo of the past.
Listen to the voice of independence.
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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Discover the beating heart of American democracy, where ideals of liberty were forged and etched into 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
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More ideas for self-guided walking tours, scavenger hunts & city quests in the same city

Decipher the hidden conspiracy behind the Declaration of Independence. Eight landmarks hold the coded truth the Founding Fathers concealed from history.

Uncover the hidden oath sworn by Founding Fathers in 1787, a secret pact that shaped the Constitution but was buried in shadows. Decode clues across landmarks to reveal the truth before it fades forever.

Track down Thomas Paine’s lost manuscript pages hidden across Old City and expose the conspiracy that tried to erase his radical ideas.

Decode a cryptic prophecy hidden by the Founding Fathers in 1776, foretelling America's destiny. Follow their secret trail through Philadelphia's revolutionary heart to expose the final revelation before it's lost forever.

Track down Benjamin Franklin’s scattered cipher fragments and crack the code that reveals his secret blueprint for America’s future.

Decipher hidden codes embedded in the Declaration and Constitution to expose a conspiracy that nearly derailed the American Revolution. Uncover the truth before the British do.
The spirit of urban renewal on the Delaware
Where American independence was forged
Academic elegance and Ivy League mysteries
Steel city with Moravian charm
Where the iconic boardwalk meets casino lights
Delaware's historic capital
Coupe-file disponibles pour les sites payants de votre parcours. Gagnez du temps, vivez l'aventure pleinement.
24$. Explorez des artefacts originaux et des expositions immersives sur la guerre d'Indépendance.
19$. Un musée interactif dédié à la Constitution des États-Unis, avec des expositions multimédias captivantes.
10-15$. Goûtez le sandwich emblématique de Philadelphia, inventé en 1930, dans l'un de ses lieux historiques.
10$. Promenez-vous dans la plus ancienne rue résidentielle habitée des États-Unis, datant de 1702.
💡 Réservation optionnelle — vous pouvez aussi acheter sur place. Tous les liens ouvrent dans une nouvelle fenêtre, votre visite OddballTrip reste préservée.