For me it’s Zombie Panic Source, but I’d love to hear others.

  • Die4Ever
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    4 months ago

    Deus Ex, added to my library Aug 18th 2011, I also owned it before Steam though, I think I bought it in 2001

    Although I’ve owned The 7th Guest since 1993 and I do have that installed lol which is probably my actual longest owned game that I have installed currently.