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Unique gameplay elements, such as gravity flipping, wall-walking and deathwalk, create an incredibly original first-person shooter experience.
Portal technology allows enemies to appear out of thin air, creating new and completely original puzzles and gameplay techniques.
Highly organic, living environment that is an enemy to the player.
In single-player mode, spirit hawk allows you to decipher the spaceship's alien language and find advantages in battle.
Built on an enhanced Doom 3 engine, the most impressive 3D engine used in a released game.