'A Black Mesa Christmas'
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By KingDaniel

Installation:
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To get it to work you need to put Black_Mesa_Xmas.bsp in the Half-Life/maps folder, run Half-Life and in the console type map black_mesa_xmas (without the quotes, obviously)

Or...

(this one might only work in pre-steam HL1)Put the map in the Half-Life/maps folder, then stick the Black_Mesa_Xmas.bat file in your Half-Life folder (so it's next to HL.exe, the Valve, Gearbox folders etc.) and double click.  If windows says "Do i allow this file to run?" click ALLOW.  Then run it again. 
It should work. 

Stuff...
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Make sure your HL CD is in for essential music!!
Play Time:  Approx. 2-3 mins.
I got a bit carried away with this, i'm afraid :)
It took a few hours over 3 days.
And I blame it's content on being raised playing Nintendo games...
Enjoy!

Thanks to:

Clark - for the idea

Merry Christmas!!!