Originally Posted by Gamespot

The gameplay in Geist revolves around your ability to possess both living things and inanimate objects. People and animals can't just be overtaken at any time, though; you'll be able to possess them only when they're sufficiently frightened. This is where you'll want to mess with objects in the environment. In the level we played, we dove into a spotlight and made it flicker and move around in an attempt to scare a nearby guard. This guard wasn't so easily frightened, though; instead, he simply walked over and unplugged the lamp. Afterward, we possessed a dog's food bowl and then made the food pop out of the bowl when the dog went to take a bite. This scared the dog enough that we were able to possess it and run around (complete with snout protruding from the bottom of the screen) to accomplish our goal. You'll be able to possess many Volks agents and use their abilities and weaponry to advance as well, though just as often you'll have to be a little creative to find a way to get through a particular situation.