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I left my HL2 DM map to compile and open in the game to test, then came back an hour later.
When I looked at the screen there were bullet holes all over the place.
Apparently a few different people had signed onto my server and apparently auto-downloaded the map. To there dismay probably, there were no weapons, and the walls were only textured with the dev textures.
How do I test a map without creating a server on the Internet?