About 6-8 hours for a first playthrough, longer if you explore secrets. Alternative: Half-Life: Blue Shift – The Other Expansion If you enjoy Opposing Force , try Half-Life: Blue Shift – you play as Barney the security guard. It’s shorter but adds more backstory. It’s also available on Steam, often bundled for a few dollars. Final Verdict: Is It Worth Playing in 2025? Absolutely. Half-Life: Opposing Force isn’t just nostalgia. It’s a tightly designed action game with set pieces, horror elements, and surprising emotional beats. The Race X aliens feel unique, the weapons are satisfying, and the final battle against the Gene Worm is unforgettable.
Not officially. However, the fan project "Operation: Black Mesa" is remaking Opposing Force in the Black Mesa engine – it’s free but requires Black Mesa . Half-Life- Opposing Force PC Game Free Download Direct Link
While you won’t find a legitimate (outside of rare Steam giveaways), the asking price is a steal for one of the greatest FPS expansions ever made. About 6-8 hours for a first playthrough, longer