"By evolving our development process to an episodic approach, we're able to reduce risk from things such as schedule and funding and invest more in new types of gameplay," said Gabe Newell, president and co-founder of Valve. "This allows us to produce innovative titles such as Portal and Team Fortress 2 and deliver them in a timely fashion to customers along with Episode Two."

Episode Two advances the 16-million unit selling franchise, as Valve's trilogy of episodic single player releases continues the award-winning story of Half-Life 2. Armed with new weaponry and vehicles, Dr. Gordon Freeman must race through a countryside riddled with an increasingly fierce Combine threat.

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