It's a solid shooter that deviates enough from Half Life to give it it's own identify, even if the merging of two well-known styles (narrative-based FPS and old-school FPS) is a bit weird. Whilst Opposing Force was desperately behind schedule during development - and it shows in the last level - a load of other developers were called in to help make the game, and this also shows as well. Again developed by Gearbox Software, and was released almost two years after Opposing Force in 2001.
