to play gmod 9 u need a source game, after that u might have a tool called 'Source SDK base 2006' if u have it u need to put the gmod in folder 'Steam>steamapps>sourcemods' open steam, go to library>tools and right click source sdk base 2006 and then properties. click set launch options then write -gmod9 then press ok and then restart steam. after u restart double click source sdk base 2006 and u can play! (if it doesnt work i think u shuld do it on source sdk base 2007 and if it still doesnt work im sorry.)
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