Valve have created Expiration Date, a 15 minute animated short featuring all the Team Fortress characters.
Valve have announced they will release their Source 2 engine for free to content developers.
The first minutes of the original Half-Life are brought to life in this live action short, Half-Life: Origins.
Portal 2: Lab Rat - Part One
Read part one of Portal 2: Lab Rat, a comic created by Valve to bridge the old and new game in the series.