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 celebrating the 20th anniversary of its iconic game, Half-Life 2, with a major update and a free weekend on Steam. Players can grab the game for free until November 18 at 1 PM ET (11.30 PM IST) after which it will return to its regular price of $9.

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,

Half-Life 2 has broken its own concurrent player record on Steam. According to SteamDB, the seminal shooter has secured just over a 61.7K player peak over the weekend, the highest number of simultaneous players the game has achieved since records began in 2008.