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,

Half-Life 2 is getting a major update in celebration of the classic title’s 20th anniversary. In addition to Steam Workshop support directly within the game, Valve has fixed bugs and restored some content,

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.