It's fanmade and it uses the Orange Box build of the Source Engine, so if you can play EP2, TF2, or Portal, you're fine. It's supposed to be an accurate representation of HL1, but they aren't changing large factors.
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It's the decisions you make when you have no time to make them that define who you are.
It's the decisions you make when you have no time to make them that define who you are.
http://www.youtube.com/watch?v=oGlhgVz5r6E&fmt=22
It's the decisions you make when you have no time to make them that define who you are.