Prey - Mac Gravity Flipping  Manipulate gravity by shooting special targets located throughout the sphere. There are also zones in the world where gravity is automatically flipped in various directions. Wall Walking  Wall walk surfaces allow Tommy to traverse the sphere's walls and explore otherwise unreachable areas. Death Walking  Death isn't the end. After losing all his health, Tommy enters the Death Realm. He must battle the wraiths of fallen spirits to regain both health and spirit energy before returning to his living body. Portals  Portal technology adds a new dimension to gameplay, allowing enemies to appear out of thin air, creating new and completely original puzzles and employing advanced gameplay techniques Multiplayer  Multiplayer games take complete advantage of the unique gameplay styles of Prey, as players walk on the ceilings and walls while the map's gravity flips from side to side.