Basically, what you do is, spawn any prop from the game and make crazy contraptions and other stuff out of them. The possibilities are endless. Well, not endless, but there's a lot that can be done
. It's great fun with a few mates.
The website is, www.garry.tv/garrysmod.
This is something me and my mate made on it:
http://www.zippyvideos.com/187037802926925.html
If you have HL2, i would recommend downloading this mod.
