Valve
Valve is a american publisher and developer founded in 1996 by Gabe Newell.
This company is responsible for games like Left 4 Dead 2, Portal: Still Alive, Left 4 Dead e The Orange Box.
Founded in: 1996
Also known as: Valve Software, Valve Corporation, Valve L.L.C.
Valve's links
en.wikipedia.org/wiki/Valve_Corporation
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