no it cost 10 bucks on steam plus u need 1 source game like counter-strike source or half-life 2 there are others but these and day of defeat source are ones you should get first css=$20 hl2=$20 dods=$10 gmod=$10 total=$60 you dont need all
I suggest getting Team Fortress 2 bundle.
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gmod is 10$ at garrysmod.com
Garry's mod 9 is free, it was the last free version. it uses steam to launch as it resource files are all valve games. you cant star gmod without steam
No. Gmod is only for PC
no. gmod is only for the pc.
steam/steamapps/username/gmod/gmod/data/adv_dup(or something like that)/* *place dupe .txt file or file folder with dups in it, here)