In this self-guided walking game you play as the young Johannes Gutenberg in Mainz during 1430, before the printing press made him famous, on a hunt for the lost relic of St. Martin that could pull the city back from the brink of chaos. You will start at the Gautor and follow clues down through the old town: St. Stephan's Church with its glowing blue Chagall windows, the Carnival Fountain on Schillerplatz, the Gutenberg monument, the mighty Mainz Cathedral, the Renaissance Market Fountain, the WWI Nail Column and the Memorial of German Unity, finishing at the Fischtor on the banks of the Rhine. At each stop you will investigate your surroundings to solve a puzzle that reveals your next clue, along with the real stories behind the landmarks: why citizens hammered nails into a wooden column during WWI, or what the market fountain has to do with the Peasants' War. You can play alone or bring your whole group, any day and any hour: just book a ticket and start whenever you want. The walk takes about 90-120 minutes with optional breaks, over roughly 2.5 km (1.5 miles).