Discover important historical sites in Berlin from the WWII period through an interactive smart phone app. Unlock the stories behind iconic landmarks and lesser known points of interest from the Nazi era by solving clues that guide you from place to place.   After purchase, use the access code that is delivered to your email to download the app and start playing the game. Head to the starting point at Hausvogteiplatz whenever you choose and move at your own pace. Play the role of a person helping someone escape from war-torn Germany and learn firsthand about the horrors of the Nazi regime. Don't worry if you get stuck on a clue – simply ask for a hint and then navigate to the next location without the need for a map, GPS, or a physical guide. With no time limit and the ability to pause and restart whenever you want, the game is flexible for your convenience. If you choose to play it straight through, it generally takes around two hours. For larger groups, one person can purchase access for the entire group by selecting the number of people in the group. All group members will be able to play the city game on their smartphone. Alternatively, each person can purchase their own ticket. You can play as a group and solve the clues together as you walk, or you can split into smaller groups/teams and compete against the others. Each person can also play on their own, separate from the group, and meet the group at the end.