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Half-Life 2: Episode One Hints
What all is new in this episode?
1 of 5: Mainly just the actual content, such as plot points and new places to go.
2 of 5: There's an interesting new "commentary track" that you can choose to enable when you start a new game. It makes lots of little commentary "word balloons" pop up that you can activate to hear comments from the Valve development team.
3 of 5: NOTE: The game will say that you're invincible in commentary mode, but that's only true when a comment is playing.
4 of 5: There are no new weapons, but there are a few new enemies, including stalkers (which you saw but didn't fight in the main game) and zombines (Combine soldiers taken over by headcrabs).
5 of 5: There are also several new tunes, but few are notably cool.