Mine was Left 4 Dead 2 but that was from a physical copy, my first store purchase was Serious Sam HD.
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Portal 1. Valve gave it away for free several years ago :D
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Bought the Orange Box back in 2007, played TF2 and Portal.
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Garry's Mod (It was a HL2 mod before so technically bought HL2 first then Garry's Mod, same day)
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Like the title says, what was your first game on steam? You can find it by clicking your name in the upper right, account details, then view license and product key activation and scroll all the way to the bottom.
My first steam account was hacked by an ex and I never got it back, so I am not sure there. But on this steam account it was Skyward Collapse.
The very next day I got Psychonauts and Costume Quest.
GA 1, Let's Party! (At the moment, 449 entries vs 526 responses, wow!)
GA 2, Unexpected Guests? (378 out of 526)
GA 3, Uh oh, party invaded. (271 out 526)
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