Map of Europe for "Spymaster"

Spymaster is a free-to-play game for iPad only. The game was "located" in a secret bunker during WW2 and player had a 3d map to move his agents around the Axis occupied Europe to perform sabotage and surveillance missions.

I remember building and designing the map was especially interesting and different kind of challenge. Playability is the key here. It has to be clear but yet interesting and fit the WW2 spy style.