When the demo began, Levine told us that the game sports an amazingly deep invention and research system, allowing the player to modify everything from his weapons to his own body. This, in turn, encourages experimentation, as there are dozens (if not hundreds) of ways to approach any given situation

One thing that I can tell you is that no words can describe the visuals and physics that appeared on the screen during the aforementioned sequences. All of a sudden, Half-Life 2 looked like a very old, outdated game.