Uploaded January 2013 | Updated September 2026, 2 weeks ago

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Testing some co-operative multiplayer in Half-Life Alpha v 0.52, an unintended feature left in as a byproduct of the game's Quake origins. Join Ivan and Ivan as they venture into the depths of the in-development build of Black Mesa in their struggle against stubborn doors, unhelpful friendly NPCs, and cheap Headcrab kills.

Full Valve developer playthrough: youtu.be/phTjVY04_k0
Alpha tech demo footage: youtu.be/2h7bTo5xLyQ
Alpha deathmatch footage: youtu.be/ZUMv7_zIHec