Explore Zurich together with Albert Einstein and learn the fascinating story of one of the smartest people in history. Join the scientist in his most popular thought experiments and help him develop the General Theory of Relativity. Each clue will lead you from one place to another, giving you exact directions so you won't need a map, a GPS or a guide. When you solve the clues and guess the answer, the secret story of that place is unlocked. The tour will take you from 1.5 to 2 hours to complete, but there’s no time limit so you can finish it at your own pace. After you buy the quest, an access code will be delivered to you by mail, which will be used in the downloadable app. You can play the game offline, so you won’t even need an internet connection. Just download the Questo app, go to the starting point and be ready to begin the adventure. 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 voucher. 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.