Half-Life, Counter-Strike, and even Day of Defeat have been updated by Valve
It was choppy, unreliable, and populated almost entirely by screamy mic spammers, but my word, do I miss the days of Half-Life Deathmatch Source. It's one of the enduring images of my own PC gaming past - a team of HLDM Source players, all wearing the G-Man skin, sprinting through the Black Mesa lab map and coating the walls with satchel charges. Half-Life 3 may very well be in the works, but Valve hasn't forgotten about the classics. Counter-Strike Source, Day of Defeat, Team Fortress 2, Half-Life 2 Deathmatch, and my beloved my HLDM have all gotten sudden, surprise patches.
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