Counter-Strike originally started off as a mod of which other Valve game?
In Portal, when you go through a a blue portal, you will pop out of a portal that is which color?
Which of these is NOT a name of a playable character in the first Left 4 Dead?
Which of these games was not included in The Orange Box, released in 2007?
What is the name of the city wherein Half-Life 2 takes place?
In Team Fortress 2, the minigun would most typically be the primary weapon of which character?
Who wrote and composed the theme song for Portal, Still Alive?
What is the name of the World War II mod of Half-Life that is officially developed by Valve, but originally as a 3rd-party mod?
What is the name of Valve's electronic content delivery system?
What is the name of the AI system in Left 4 Dead and Left 4 Dead 2 that dictates much of the gameplay?