Prison Break

You are in East Berlin in the GDR in the 1960s. You were wrongly suspected by the Stasi of having spied for the West. Since there is no proof of your innocence, you have to go to prison for an indefinite period of time. But you are very lucky because you found out that the prisoners before you somehow managed to break out of this prison. That gives you hope. There are also rumors that before escaping, they left clues in the cells for other innocent inmates to hide from the guards. The guards will change guard in an hour. Each guard checks the cells before the shift begins. So you only have 60 minutes left for your project.