A modern city rally awaits you, during which you will find tricky puzzles and interesting information. With the very first task you will be immersed in a world full of hidden clues and mysterious hints. You'll actively communicate with each other, as you get closer to each other and enrich each other with your knowledge. Throughout your tour you will experience such prominent sites as the Parliament Building (Reichstag), Brandenburg Gate, Gendarmenmarkt, the Magnificent boulevard Unter den Linden, Potsdamer Platz, Checkpoint Charlie, the Berlin Wall, among other Berlin sights. You decide when you start and finish your adventure, being completely independent of travel guides and groups. To participate, you only require a smartphone with an active internet connection.