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, along with a two-hour documentary, developer commentary, and much more. The game is also free on Steam until November 18. Valve’s announcement itself is an interactive experience — grab the gravity gun at the bottom of the page and you can pick up just about anything on the
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