Half-Life 2: Episode One is a first-person shooter video game, the first in a series of episodes that serve as the sequel to the 2004 Half-Life 2. It was developed by Valve Corporation and released on June 1, 2006. Wikipedia
Initial release date: June 1, 2006
Series: Half-Life
Engine: Source
Genre: First-person shooter
Awards: VGX Award for Cyber Vixen of the Year
Platforms: Microsoft Windows, Xbox 360, PlayStation 3, Linux