Named Game of the Year by over 50 publications, Valve's début title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world.
A little tutorial on how to make Half-Life 1 maps by HLCRAZY.
Posted by HLCRAZY on May 22nd, 2012
Googling most of the tools used should get you them, I was rushed.
Sorry for the terrible platform choice as well :S Youtube seems to hate me.
This tutorial is based remotely on a request by gearlord707.