# Games like Half-Life: Opposing Force

> The closest matches to Half-Life: Opposing Force: Half-Life: Blue Shift, Half-Life, Black Mesa, Crysis Warhead®, and Halo: Campaign Evolved. Ranked by imho.run from Steam co-play data, shared tags and reviews.

## Similar games, ranked

The full ranked list, 24 games, best match first (the HTML page shows the top 8 as cards).

1. [Half-Life: Blue Shift](https://imho.run/games/130/half-life-blue-shift) — Also Silent Protagonist and Aliens, like Half-Life: Opposing Force. 9,803 Steam reviews, 93% positive. [Steam](https://store.steampowered.com/app/130/)
2. [Half-Life](https://imho.run/games/70/half-life) — A frequent pick in Half-Life: Opposing Force players' libraries, and another Action. 57,390 Steam reviews, 96% positive. [Steam](https://store.steampowered.com/app/70/)
3. [Black Mesa](https://imho.run/games/362890/black-mesa) — Also Aliens, like Half-Life: Opposing Force. 69,272 Steam reviews, 95% positive. [Steam](https://store.steampowered.com/app/362890/)
4. [Crysis Warhead®](https://imho.run/games/17330/crysis-warhead) — Also Aliens and Military, like Half-Life: Opposing Force. 1,467 Steam reviews, 84% positive. [Steam](https://store.steampowered.com/app/17330/)
5. [Halo: Campaign Evolved](https://imho.run/games/2806050/halo-campaign-evolved) — Shares weapon variety with Half-Life: Opposing Force. 13,603 Steam reviews, 61% positive. [Steam](https://store.steampowered.com/app/2806050/)
6. [STAR WARS™: Dark Forces Remaster](https://imho.run/games/2292260/star-wars-dark-forces-remaster) — Also 1990's, like Half-Life: Opposing Force. 943 Steam reviews, 92% positive. [Steam](https://store.steampowered.com/app/2292260/)
7. [Call of Duty®: Black Ops](https://imho.run/games/42700/call-of-duty-black-ops) — Also Military, like Half-Life: Opposing Force. 14,521 Steam reviews, 91% positive. [Steam](https://store.steampowered.com/app/42700/)
8. [Aliens vs. Predator™](https://imho.run/games/10680/aliens-vs-predator) — Also Aliens, like Half-Life: Opposing Force. 7,954 Steam reviews, 90% positive. [Steam](https://store.steampowered.com/app/10680/)
9. [Delta Force 1](https://imho.run/games/32620/delta-force-1) — Also Military and 1990's, like Half-Life: Opposing Force. 322 Steam reviews, 89% positive. [Steam](https://store.steampowered.com/app/32620/)
10. [F.E.A.R.](https://imho.run/games/21090/f-e-a-r) — Same atmospheric mood as Half-Life: Opposing Force. 7,974 Steam reviews, 94% positive. [Steam](https://store.steampowered.com/app/21090/)
11. [Shadow Ops: Red Mercury](https://imho.run/games/286770/shadow-ops-red-mercury) — Shares difficulty spikes with Half-Life: Opposing Force. 124 Steam reviews, 73% positive. [Steam](https://store.steampowered.com/app/286770/)
12. [Sniper: Ghost Warrior 2](https://imho.run/games/34870/sniper-ghost-warrior-2) — Also Military, like Half-Life: Opposing Force. 3,902 Steam reviews, 70% positive. [Steam](https://store.steampowered.com/app/34870/)
13. [Warhammer 40,000: Boltgun](https://imho.run/games/2005010/warhammer-40-000-boltgun) — Also 1990's, like Half-Life: Opposing Force. 10,885 Steam reviews, 91% positive. [Steam](https://store.steampowered.com/app/2005010/)
14. [Medal of Honor™](https://imho.run/games/47790/medal-of-honor) — Also Military, like Half-Life: Opposing Force. 2,520 Steam reviews, 80% positive. [Steam](https://store.steampowered.com/app/47790/)
15. [Homefront](https://imho.run/games/55100/homefront) — Also Military, like Half-Life: Opposing Force. 2,148 Steam reviews, 63% positive. [Steam](https://store.steampowered.com/app/55100/)
16. [Titanfall® 2](https://imho.run/games/1237970/titanfall-2) — Also Military, like Half-Life: Opposing Force. 93,771 Steam reviews, 96% positive. [Steam](https://store.steampowered.com/app/1237970/)
17. [Starship Troopers: Ultimate Bug War!](https://imho.run/games/2321780/starship-troopers-ultimate-bug-war) — Shares weapon variety with Half-Life: Opposing Force. 727 Steam reviews, 94% positive. [Steam](https://store.steampowered.com/app/2321780/)
18. [Duke Nukem 3D: 20th Anniversary World Tour](https://imho.run/games/434050/duke-nukem-3d-20th-anniversary-world-tour) — Also Aliens and 1990's, like Half-Life: Opposing Force. 3,174 Steam reviews, 81% positive. [Steam](https://store.steampowered.com/app/434050/)
19. [Quake](https://imho.run/games/2310/quake) — Also 1990's, like Half-Life: Opposing Force. 9,755 Steam reviews, 96% positive. [Steam](https://store.steampowered.com/app/2310/)
20. [Aliens: Colonial Marines Collection](https://imho.run/games/49540/aliens-colonial-marines-collection) — Also Aliens, like Half-Life: Opposing Force. 4,221 Steam reviews, 58% positive. [Steam](https://store.steampowered.com/app/49540/)
21. [Serious Sam HD: The First Encounter](https://imho.run/games/41000/serious-sam-hd-the-first-encounter) — Shares weapon variety with Half-Life: Opposing Force. 2,396 Steam reviews, 91% positive. [Steam](https://store.steampowered.com/app/41000/)
22. [Far Cry®](https://imho.run/games/13520/far-cry) — Same tense mood as Half-Life: Opposing Force. 4,707 Steam reviews, 77% positive. [Steam](https://store.steampowered.com/app/13520/)
23. [Battlefield 3™](https://imho.run/games/1238820/battlefield-3) — Also Military, like Half-Life: Opposing Force. 5,027 Steam reviews, 69% positive. [Steam](https://store.steampowered.com/app/1238820/)
24. [Brothers in Arms: Earned in Blood™](https://imho.run/games/19800/brothers-in-arms-earned-in-blood) — Also Military, like Half-Life: Opposing Force. 575 Steam reviews, 84% positive. [Steam](https://store.steampowered.com/app/19800/)

## Machine-readable

The same ranked list as JSON from the imho.run API for AI assistants (GET, no key, same site as this page):

- Top 20: https://imho.run/api/agent/games-like?q=50&n=20
- Co-op games only: https://imho.run/api/agent/games-like?q=50&n=20&coop=true
- Free games only: https://imho.run/api/agent/games-like?q=50&n=20&free=true
- Facts about this game: https://imho.run/api/agent/game-facts?q=50
- This page as markdown: https://imho.run/md/game/50
- API docs: https://imho.run/developers (OpenAPI: https://imho.run/openapi.json, MCP: https://imho.run/mcp)

## About Half-Life: Opposing Force

Half-Life: Opposing Force is a 1999 first-person shooter developed by Gearbox Software and published by Valve, presenting the Black Mesa incident from the perspective of the military forces sent in to contain it. The game's core mechanics include weapon-variety, ammo-scarcity, and challenging difficulty-spikes that create a distinctly tense experience. Players take on the role of Specialist Adrian Shephard, experiencing a simultaneous-narrative that unfolds alongside events from the original game while offering new alien enemies and equipment. Reviewers highlight the gunplay as feeling more visceral than the original, while players describe the military-themed teammates as adding unexpected humor to the experience. According to player feedback, the atmosphere and immersive quality make it feel nostalgic. The game holds a 95% positive rating from 13,108 Steam reviews, costs $4.99, and runs on Steam Deck, offering roughly 6-8 hours of challenging solo content.

## Game info

- **AppID:** 50
- **Developer:** Gearbox Software
- **Publisher:** Valve
- **Genres:** Action
- **Categories:** Multi-player, Single-player, Family Sharing, Custom Volume Controls, Playable without Timed Input, Adjustable Difficulty, Save Anytime, Valve Anti-Cheat enabled
- **Released:** Nov 1, 1999
- **Free to play:** no
- **Platforms:** windows, mac, linux

## Links

- [Full page with filters and more lists](https://imho.run/games/50/half-life-opposing-force)
- [The same list as JSON, no key](https://imho.run/api/agent/games-like?q=50&n=20) — the API for AI assistants, see https://imho.run/developers
- [Steam store](https://store.steampowered.com/app/50/)
- [Personalized recommendations](https://imho.run/) — sign in with Steam or paste a SteamID for a library-aware ranking

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