One phone, or one each
The game runs in the Questo app. Share one phone as a team, or play on your own — either way, start with a charged battery.
Prague, Czechia · Outdoor mystery game
Twelve signs.
Twelve signs.
Nobody ever found the thirteenth.
Victor Kral believed Prague's clocks, statues and house signs formed a hidden pattern. His notes end before he says what the Thirteenth Sign is.
Free while testing
Testing round only
Come and play — free.
The Thirteenth Sign is finished and live in the Questo app. One signup unlocks every case in testing — Prague and both Maribor cases.
Each case has 50 tester places of its own. They go in the order the signups arrive.
Thank you — your address is with us. We send each invite by hand, usually within the hour. It comes from Questo, so check Spam, Junk and Promotions too.
How it works
- You leave an email address. That is the whole signup.
- You get an invitation that unlocks the cases in the Questo app for free. The account is free; if you already have one, give us that address.
- You play alone or in a group, any day, any hour. The game is played in English.
- You tell us what worked and what did not — and if the case earned it, you leave a review on Questo.
Prefer a DM? Write to @enigvia or info@enigvia.com.
Case 004 · Prague
The Thirteenth Sign
Victor Kral, a researcher, disappeared while searching for a hidden pattern across Prague. He believed twelve signs scattered through the Old Town pointed to something he called the Thirteenth Sign. His notes end before he says what it is.
Your investigation
You take over his unfinished work. The manuscripts lead you through the Old Town and the Jewish Quarter, where clocks, statues, Hebrew symbols, medieval towers and old house signs each hold a piece of the pattern.
Every challenge needs the city itself. The manuscript tells you where to look; the answer is always in something that really stands in Prague — carved, painted, counted or placed in a particular order. Eight challenges, one thread.
The places, the clocks, the architecture and Prague's legends are real and researched. Victor Kral, his manuscripts and the investigation are fiction.
The route
- Old Town Square — Astronomical Clock · start
- Old Town Bridge Tower
- Charles Bridge — statue of St. John of Nepomuk
- Jewish Town Hall — the Hebrew clock
- Old-New Synagogue
- Celetná Street — old house signs
- Powder Gate · finish
The route runs through the Old Town and the Jewish Quarter and ends at the Powder Gate. Every observation you need can be made from public ground — no tickets, and no going inside.
60–90Minutes
1–5Players
8Challenges
ENGame language
Practical
What you need.
Comfortable shoes
The route follows the cobbled streets of the Old Town, crosses Charles Bridge and returns to the Powder Gate.
Daylight helps
You can play at any hour, but several challenges depend on reading detail on façades and statues.
No booking
No guide, no fixed hour, no group. You start whenever it suits you.
No entry fees
Everything you have to observe is visible from the street. You never need to go inside a building.
Game language
English for now. This page is in English, Slovenian, Czech and Slovak.
Getting there
The game starts on Old Town Square.
In front of the Astronomical Clock, in the heart of the Old Town. No ticket desk and no guide — stand far enough back to see the figures beside the astronomical dial, and open the app.
By metro
Line A, Staroměstská station. From there it is about a five-minute walk to Old Town Square.
On foot from the main station
About 1.5 km from Praha hlavní nádraží — 15 to 20 minutes through the Old Town.
From the airport
Bus 119 to Nádraží Veleslavín, then metro A to Staroměstská. Around 45 minutes in total.
The square is open at every hour and no step of the case depends on opening times — you can start whenever you like. Open the start point in Maps.
Case 004 · Open for testing
What is the Thirteenth Sign?
Victor Kral never found out. Everything he needed is still standing in Prague.