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Half-Life 2: By taking the suspense, challenge and visceral charge of the original, and adding startling new realism and responsiveness, Half-Life 2 opens the door to a world where the player's presence affects everything around him, from the physical environment to the behaviors even the emotions of both friends and enemies.

Half-Life 2: Episode One is the first in a series of new adventures created by Valve that extend the Half-Life 2 single player experience. It details the aftermath of Half Life 2 and launches a journey beyond City 17.

Half-Life 2: Episode Two -- the second installment in Valve’s episodic trilogy advances the award-winning story, leading the player to new locations outside of City 17.

Portal -- a pioneering type of single player action game that rewrites the rules for how players approach and manipulate their environment - much like how Half-Life 2’s Gravity Gun reinvented the way gamers interact with objects in the game.

Team Fortress 2 -- an all-new version of the legendary title that spawned team based multiplayer action games. The game’s daring new art style features the most advanced graphics of any Source-based game released to date.