Starting at the Allée des Grand-Places, you'll open the Explorial app, enter the 6-digit game code that you received by text and Viator chat message, and wind down into Fribourg's remarkably intact medieval town. The tour is fully self-guided — no guide, no fixed start time, just your group and the city. The Fontaine de Samson flexes first — one of the Renaissance fountains that punctuate the old town, this one showing Samson mid-lion-wrestle. Riddles test your strength of knowledge instead. The Cathédrale Saint-Nicolas rises next, its Gothic tower dominating the skyline; 368 steps wait for the ambitious. Trivia stays at ground level with the stained glass. Then the Pont de Berne crosses the Sarine on wooden beams as it has since the 17th century, the river district's covered classic. Around two hours across bridges and language borders. The leaderboard announces results bilingually, in the spirit of the place.