Half-Life: Opposing Force
Gearbox Software · Valve
- Released
- Nov 1, 1999
- Platforms
- Last updated
App relationships
| App | Relationship | Price (US) | Store |
|---|---|---|---|
 Half-Life App ID 70 | Shared depot source | $9.99 | Steam |
App 228980 · Details unavailable App ID 228980 | Shared depot source | Unavailable | Steam |