What games do I need to play GMod?You need at least one Valve Source Engine game, there's a list of them here. Steam won't let you buy Garry's Mod on its own if you're unable to play it.
IT SAYS RIGHT ON THE GOD DAMN GARRYSMOD WEBSITE.HOLY stuff, LOOK WHAT I FOUNDhttp://www.garrysmod.com/faq/I"M TIRED OF YOU handicaps COMING HERE AND ASKING THIS CRAP
Do i need hl2 or can just use hl2 episode 1 with Garry's Mod?