Starting at 428 Bull St, you'll open the Explorial app, enter the 6-digit game code that you received by text and Viator chat message, and drift into the historic district's oak-lined grid. The tour is fully self-guided — no guide, no fixed start time, just your group and the city. The Cathedral Basilica of St. John the Baptist rises first, its white Gothic spires impossible to miss. Riddles delve into stained glass, fires and resurrections. Colonial Park Cemetery follows — Savannah's oldest burial ground, where trivia untangles duelists' graves and headstones rearranged by occupying soldiers. Then Monterey Square, framed by moss-draped oaks and storied mansions, sets the scene for the closing photo challenge. Expect around two hours at Savannah pace — unhurried, shady and just a little spooky. The leaderboard has the final word.