Half-Life 2: RESEARCH AND DEVELOPMENT - Full Walkthrough
So I installed a mod for Half-Life 2... - "Research and Development"
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![Let's Play! - Research and Development - Part 1 - N.E.R.D.S. - [Half Life 2 Mod]](https://img.youtube.com/vi/z-Kffm-q1pw/0.jpg)
