<P> Half - Life 2 : Episode Two is a first - person shooter video game , the second in a series of episodic sequels to the 2004 Half - Life 2 . It was developed by Valve Corporation in tandem with Episode One , the first game in the series , and released in 2007 via Valve 's Steam content distribution platform . The episode was released both separately and as a part of a bundled package , The Orange Box . </P>
when was half life 2 episode 2 released
in 2007