Valve®, developer of the blockbuster series Half-Life® and Counter-StrikeTM, announced Half-Life® 2: Episode One is now available via Steam and at retail outlets around the world. The first in a trilogy of episodic games, Episode One reveals the aftermath of Half-Life 2 and launches a journey beyond City 17. Episode One does not require Half-Life 2 to play and also includes a first look at Episode Two, which will ship by year's end.

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