Where do I get the map editor for valve games?

A

Adam D

New member
Hello, I have been looking at different mods like Gary's mod and such but I was wondering what do I have to do to get that game? I think it might be called Source? But I'm not all to sure, also what would be the requirements for that? Like would I have to buy half life 2 or something or can I just find it on the internet?
 
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