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Valve turned 20 yesterday: happy birthday!
Valve reached out to s1mple : r/GlobalOffensive
Valve Takes A Joyous Trip Down Gaming Memory Lane, Celebrating Steam's 20th Birthday
20 Years of Valve: Looking Back at Its Long History
Valve Sells Software, So What's With All The Hardware?
Valve turned 20 yesterday: happy birthday!
20 Years of Valve: Looking Back at Its Long History
Valve to sell non-gaming software on Steam starting September 5th - Polygon
Steam turns 20 years old today [Sale & Retro Throwback Store Page now live] PC - Valve