It's hard to believe that, prior to Half-Life 2, Valve had really made only one game. Of course, it was a masterpiece. Half-Life single-handedly reinvented the first-person shooter, putting the emphasis on cinematic pacing and complete immersion in the experience. As a result, it paved the way for many of the outstanding first-person shooters that have followed. And while there was little question that there would eventually be a sequel, no one could have imagined the long and torturous development process that led to Half-Life 2. Well, it's time to forget about that, because Half-Life 2 has arrived.