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So, I heard from a friend that in order to play Garry's mod, you need to have a source game. Now, Team Fortress 2 is free, and I'm pretty sure it is built with the source engine, so is that enough? Do I have to buy Counter Strike? Do you still have to buy Counter Strike Source? I'm not really sure. The steam page says nothing, but my info is probably old. I just want to know before I buy it.