To celebrate the game’s 20th anniversary, Valve is offering Half-Life 2 for free until November 18th with additional content including developer commentary mode, improved graphics, and more.

Valve is celebrating Half-Life 2's twentieth anniversary, launching a documentary, a significant game update, and making the title temporarily free.

To celebrate that Half-Life 2 has turned 20, Valve has made it free to claim and keep for a limited time. Not only that, but Episodes One and Two are now included with a huge upgrade.

Time surely flies, and Gordon Freeman's followers know it better than anyone. Half-Life 2 is celebrating its 20th anniversary, and Valve has decided to make good on the occasion. The developers have launched a significant update that makes the classic even better. It is available on Steam for free until November 18.