See this page for Mod Installation, Development, Contribution Guidelines, License and Acknowledgments ...

This open source repository of scripts I have written up for maps in Garry's Mod Zombie Survival are free to use by anyone under the condition that credit is given to me since getting the vectors and ...

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The mod is free, and I'm going to go ahead and vouch for it; this is an experience that's both short and worth your time. I assume all of you have a copy of Half-Life 2 on your Steam accounts, so ...