Half-Life 2 does give us some clues about her past ... who helps open the door after the Resonance Cascade, but Isaac Kleiner has always been up for debate. He's clearly based on the "scientist ...

In the finished Half-Life 2, there's a section where Gordon and Alyx are fighting through City 17 trying to reach Barney, and come to a destroyed bridge. You end up dropping down to the canal before a ...

Early builds of Valve's Half-Life 2 originally spent far more time in the sewers, so much so that it led straight back to the Citadel.