LogFAQs > #939162479

When Half-Life 2 came out, I bought the Valve collection through Steam. That was 2004. Sometime after that I bought the first non-Valve game on Steam, Rag Doll Kung Fu. It was fun for maybe five minutes and then I had buyer's remorse that was so strong I remember the game title after all these years. I can't remember what my next purchase was, probably another Valve game, I think it took a while before they added anymore non-Valve titles to Steam.

Checking the license page:

Nov 6, 2008 Left 4 Dead Steam Store
Jan 2, 2008 Zen of Sudoku Steam Store
Sep 12, 2007 The Orange Box Complimentary
Jun 3, 2007 Red Orchestra Complimentary
Apr 5, 2007 Dark Messiah Might and Magic Limited Retail Complimentary
May 2, 2006 Half-Life 2: Episode One Complimentary
Oct 7, 2005 Rag Doll Kung Fu Complimentary
Nov 16, 2004 Half-Life 2 Silver Complimentary

It says Half-life 2 Silver, I don't know what was in the Gold edition that I didn't get. I'm pretty sure it added all Valve games that existed on Steam as of November 2004 to my collection. Maybe the gold edition sent you physical copies. I think these early complimentary entries are before the system recorded the source of your purchase. I bought all of these in the Steam Store except Dark Messiah.

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The only reason lightning never strikes in the same place twice, is that the same place isn't there the second time.