Starting at 45 Rue des Teinturiers, on Avignon's most atmospheric cobbled street, you'll open the Explorial app, enter the 6-digit game code that you received by text and Viator chat message, and begin the hunt. The tour is fully self-guided — no guide, no fixed start time, just your group and the city. The Quartier des Teinturiers sets the tone: water wheels still turn in the Sorgue canal where dyers and weavers worked for centuries, and the riddles here reward sharp eyes. At the Palais des Papes, the fortress-palace where nine popes held court, you'll work out clues in the shadow of walls that once guarded the papal treasury. The Hôtel de Ville on Place de l'Horloge adds a newer chapter — a 19th-century city hall built around a 14th-century clock tower, with details hiding in plain sight. Expect around 2 hours at an easy pace, pausing for a café stop whenever you like. By the end, you'll know why the popes were in no hurry to go back to Rome.