Start at the Silves Tourist Office near the river — it's easy to find and the trail begins the moment you open the Explorial app. Enter your 6-digit game code that you received by text and Viator chat message, select your language, and tap Start. The route climbs through Silves' whitewashed lanes toward its Moorish heart. The Pelourinho de Silves — the medieval pillory in the main square — is an early stop, with a riddle that asks you to look at the stonework closely. The Igreja da Misericórdia de Silves, with its ornate Manueline doorway, features in an observation task that rewards anyone who slows down to study the facade. The trail finishes near the Castelo de Silves, the red sandstone castle dominating the town's skyline, where a photo challenge puts the group to work in front of the ancient walls. Groups tend to split between those racing the clock and those soaking up the views — both approaches work. The app reveals final scores and a ranking once the last clue is solved. Few towns in the Algarve have this much history in this little space.