Just to clarify for everyone in this thread seeing as 95% of the people don’t know what they’re on about
[li]Any free source game provided by any offer (aTI / Nvidia / Free portal promo for this month) do not provide the SDK and the SDK base required by Gmod.[/li][li]Just to clarify, this means you** cannot** use them as a base to buy Gmod with. You need to have at least one purchased game.[/li][li]After the promo, You still won’t be able to use this free copy to buy Gmod because it’s flagged as a free copy.[/li][li]You can use the content once you have purchased another source game to go with Gmod.[/li][li]Any source game comes with all HL2 content. This means that buying HL2 to go with Gmod is pointless, unless you want to actually play HL2.[/li][li]If you want most content for Gmod, the best combination to get is the CSS + Gmod pack, and then the Orangebox.[/li][/ul]
That should tidy everything up nicely.