First off: Do not download this. It's outdated and fucking stupid on Valve's HL2:DM release.
This was a really, really, really hacked-together version of Half-Life 1's Datacore for singleplayer Half-Life 2's multiplayer. That's right. Using the 'net_start' and 'connect' commands, players could join eachothers games and run around without prediction code and try to have fun.
My release notes at the time read:
A few things you should know before you play:
+ Players spawn in random locations
+ Infinite Aux. power (infinite sprinting and flashlight)
+ If you have Bug Bait, you can use it near areas with holes in the ceiling. The Antlions will scare the shit out of you if you run into them without proper weapons.
+ There is one super physcannon in the map in the blue beam above Reactor 1.
+ There are various pieces of rubble and destroyed objects on the ground/walls/ceiling which you can rip off if you've got the super physcannon.
+ Weapons dropped by players dissolve. mp_weaponstay is automatically set to 1 because of that.
Funny enough, a disc editor from PC Gamer UK requested my permission to put this on a coverdisc once the official HL2:DM was released. I would have changed the author's name on the map and done something insidious to the players and hijacked it all but... it's Datacore. With HL1 textures. And it is absolute shit on the official HL2:DM release.
I do wish Valve put Snark-esque Antlions in HL2:DM, though.

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