Operation City 21 is a full Half-Life 2 conversion mod, about Adrian Shephard's travels in the new world ruled by the Combine. The game takes place during the timeline of Episode Two in City 21, another Eastern European city near City 17.
- Completely new story
- Siege vehicle gameplay! (Not telling you when though)
- New weapons!
- You get to play as Corporal Shephard again!
- Completely uninterfering with the actual HL2 storyline!
- Based on VALVe's award-winning Source Engine. (What else?)
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