Since it's the steam sale, get the valve complete pack, it is very cheap now. Great games, only 25$ I think. And since you'll have those games, get Garry's Mod. On top of that, get CS:GO, but only if you're ready for elitists to yell at you for every minor mistake you make. The rest is up for you. Read the reviews, see the negative to positive ratio, do your research and you'll be good to go.
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Have em all. I regret buying GO.
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Yeah. It can be a pain. It's an acquired taste.
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Well, I played all the previous Counter Strike games. I've definitely "acquired" the taste for the games.