This should be in Tech help or Talk.
~Move please.
You forgot Left 4 DeadInsurgency is free and requires any game running on the Source engine to work, that would include Half Life 2 (and all of it's episodes), Team Fortress 2, Day of Defeat Source, Portal and Counter Strike: Source.

ok if u want to play INS(insurgency) wat i noe of u only need one source game and since u have CS(i think u'r talking about CS:S u should be able to downlaod)
i played INS for 2 days and all i have is CS:S and TF2
so im a little confused. where do i go to get insurgency? I've heard so much about it and have been interested in playing.