Teufelsberg Parkour
About
Teufelsberg (German -- "Devil's Mountain") is a 80 meter man-made hill of rubble, covering the once under-construction Nazi military-technical college following WWII. During the Cold War, there was a U.S. listening station on the hill, Field Station Berlin.
In this game, you Run and Jump your way over a re-creation of the now abandoned buildings.
"W", "S", "A", "D" move forward and back as normal. "Left Shift" to Run, "Space" to Jump. Mouse to look and steer.
There *IS* a way to get to all the interesting places, though it may not be obvious. (I think there are only 2, small, isolated towers you can't get to the top of.)