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| Release Date | 9 October 2007 |
| Publisher | Valve, Valve, EA Games |
| Content Rated | M (Mature) |
| Game Modes | Single player |
| Player Perspectives | First person |
| Genres | Shooter, Puzzle |
| Themes | Action, Science fiction |
| Platforms | Linux, PC (Microsoft Windows), PlayStation 3, Xbox 360, Mac |
