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What is a Season Pass?
Half-Life: Opposing Force Season Passes are one-off purchases that entitle you to DLC released over a set period of time. This is not a purchase of the full game itself.
Half-Life: Opposing Force Activation Instructions
| Release Date | November 10, 1999 |
| Publisher | Gearbox Software, Sierra Entertainment, Valve |
| Content Rated | M (Mature) |
| Game Modes | Single player, Multiplayer |
| Player Perspectives | First person |
| Genres | Shooter, Platform, Puzzle |
| Themes | Action, Science fiction, Thriller, Warfare |
| Platforms | Linux, PC (Microsoft Windows), Mac |
