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Half-Life: Opposing Force
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- First Released Oct 31, 1999released
- First Released Oct 31, 1999
- The official expansion for the genre-redefining Half-Life in turn sets a new standard of quality for future action-game mission packs.
- Developed by:
- Gearbox Software
- Published by:
- Valve Software, Sierra Entertainment
- Team-Based, Shooter, First-Person, Action, 3D
- All Platforms
- Animated Blood, Animated Violence
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