เปิดประวัติ Valve Corp.

https://www.youtube.com/watch?v=Dk0C5jlZnY0

https://www.youtube.com/watch?v=Jt0w9YP_wZ0

https://www.youtube.com/watch?v=AlWgZhMtlWo

https://www.youtube.com/watch?v=Na37dINcV2I

https://www.youtube.com/watch?v=e8jv24NjOWQ&t=4s

https://www.youtube.com/watch?v=nv8lkz1a42M

https://www.youtube.com/watch?v=8aPAl6cq1r0&t=199s

https://www.youtube.com/watch?v=ASVku-48N8Q

https://www.youtube.com/watch?v=qYfNzhLXYGc&t=5s

https://www.youtube.com/watch?v=5d08jt1Auck&t=5s

https://www.youtube.com/watch?v=Bv4CqIxqTMA&t=2s

https://www.youtube.com/watch?v=-cSFPIwMEq4&t=2s

https://www.youtube.com/watch?v=W0hU_UfF1ag&t=4s

https://www.youtube.com/watch?v=FwwYWOE2TWQ&t=225s

https://www.youtube.com/watch?v=tax4e4hBBZc

https://www.youtube.com/watch?v=36lSzUMBJnc

https://www.youtube.com/watch?v=SU5nEMaxf78

https://www.youtube.com/watch?v=ABd7Yo5G2hw&t=213s

https://www.youtube.com/watch?v=908dFzfvjeA&t=98s

https://www.youtube.com/watch?v=M_9RvOOdh4k

https://www.youtube.com/watch?v=G59WyzbYKVI&t=24s

https://www.youtube.com/watch?v=G59WyzbYKVI&t=24s

https://www.youtube.com/watch?v=EuiPRLz8g2Y

https://www.youtube.com/watch?v=HO1-RDcoe5U

https://www.youtube.com/watch?v=cXBGQhPsreo&t=8s

https://www.youtube.com/watch?v=tpZDyN9bM6o&t=464s

https://www.youtube.com/watch?v=XGCyfEYfLks&t=4s

https://www.youtube.com/watch?v=JRDwA3cQmlc&t=1138s

https://www.youtube.com/watch?v=j6TDjXEJaAo&t=670s

https://www.youtube.com/watch?v=OmpxKcTG8yI&t=429s

https://www.youtube.com/watch?v=5rKMeesV1jI&t=67s

https://www.youtube.com/watch?v=UKSUUvxCr2Q&t=4s

https://www.youtube.com/watch?v=_PZilNPyyks&t=301s

https://www.youtube.com/watch?v=JRV62bebOrQ&t=302s

https://www.youtube.com/watch?v=yEx7OrQr7Q8&t=19s

https://www.youtube.com/watch?v=sNWAOfskYpU&t=6s

https://www.youtube.com/watch?v=jB0MQC_vDvc

https://www.youtube.com/watch?v=upMfmgMOEJ4&t=11s

https://www.youtube.com/watch?v=E-eDQHX78Vg&t=973s

https://www.youtube.com/watch?v=YA9km4aHjzI

https://www.youtube.com/watch?v=uHCV6zQdlUc

https://www.youtube.com/watch?v=mhSdeh1iYBw&t=191s

https://www.youtube.com/watch?v=WCrl1Bqqy_4&t=170s

https://www.youtube.com/watch?v=YYljCVVIJps&t=107s

https://www.youtube.com/watch?v=BQLEW1c-69c&t=2078s

https://www.youtube.com/watch?v=_iyBOZsutqY&t=137s

https://www.youtube.com/watch?v=jjidOl6Pqto&t=297s

https://www.youtube.com/watch?v=XpExNYMxALE

https://www.youtube.com/watch?v=XpExNYMxALE

https://www.youtube.com/watch?v=SPsfaHdhXJs&t=686s

https://www.youtube.com/watch?v=TbZ3HzvFEto&t=177s