The surprise update includes a full commentary track for the base game, significant graphical and gameplay updates, and a whole lot more.

Valve has issued a 20th anniversary update for Half-Life 2, and the game is now available for free through November 18. The other titles in the Half-Life series are all on sale, with deep discounts, and there’s a new two-hour documentary about the making of the game.

There's graphics updates. There's incorporation of episodes. There's every thing your little Half-Life heart desires (except for a new game).

It’s Half-Life 2’s 20th anniversary, and in celebration, Valve has released a special update that adds the Episode One and Episode Two expansions to the base game so you can play it all straight through,

In a new two-hour documentary from Valve, current and former members of the company talk openly about the creation of Half-Life 2 as well as finally spilling the beans on what happened to Episode 3, and even showing gameplay of early prototypes of the canceled game.

Half-Life: Episode 3 remains one of the great what-ifs in gaming history. Now, on the occasion of Half-Life 2's 20th anniversary, Valve has opened up about its development in a brand-new documentary that shows never-before-seen work-in-progress footage,