Escaping and spying on the Berlin Wall Scavenger hunt

The puzzle highlights are, for example, recognizing a painting forgery, wiping off Stasi agents, solving encryptions and ultimately finding the escape tunnel.

Your mission:
Despite the socialist system in the GDR, art dealer Siegfried Kath has become a millionaire through art dealing. But the wind has changed for him & his influential supporters from the Ministry of Foreign Trade. Siegfried is no longer safe & wants to flee from East Berlin to the Federal Republic of Germany. But the wall, his ban on leaving the country & Stasi agents are all set against it. The only hope: Apparently, there's a tunnel under the Berlin Wall to escape. So far, however, this is just a rumor. Help him find & decode the clues. Time is short! The Stasi agents are on your heels to find the tunnel ahead of you. The trail takes you along the most exciting corners of Berlin's Wall Strip.