Twenty years ago this month, Valve released Half-Life 2. The company is celebrating the anniversary with a 20th anniversary update that includes new content and various bug fixes. Best of all, Half-Life 2 is free right now on Steam, but only until 1 PM ET today, November 18.

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,

Valve is honoring the 20th anniversary of Half-Life 2 with a celebration that includes a brand-new two-hour documentary, a developer commentary update, and more.

Just like it did with the original Half-Life last year – celebrating the seminal first-person shooter’s 25th anniversary with a major update, a documentary, and a 100% off sale – Valve is celebrating the arguably even more influential Half-Life 2 ’s 20th anniversary with,

Half-Life 2 is officially 20 years old this weekend, and to mark the occasion Valve has released a special anniversary update, bundling in a brand-new documentary, commentary, the previously separate Episodes 1 & 2,