Wolpaw was a driving force in writing the story and dialogue for Portal 2.
Miss out on shooting up Boomers? Now's your chance to get in on it!
Valve's classic 4-player co-op shooter might soon support the Xbox One backwards compatibility feature.
As Nazi zombies continue to overrun 1945, it's clear the Zombie Army Trilogy characters need some help. So they've called in the survivors from Left 4 Dead and Left 4 Dead 2.