This is me playing through Half Life 2. This is the beginning of the game that almost goes to the end of the underground railroad.
Throughout this video and the other parts, you may notice a sudden jump, the health, ammo, or the gun Gordon is holding change instantaneously. This is due to the fact that it isn't the cleanest of cuts and that is merely video splicing from where something didn't turn out right, I died in gameplay, etc. This video isn't perfect but it suits the purposes of a simple play-through of the game. I wasn't pulling for an Oscar, anyway.