Buy Half-Life: Opposing Force PC Key

Looking for a cheap Half-Life: Opposing Force key? As of 21 Aug 2026 the lowest offer is £4.29 at Steam, picked from 15 offers across 6 stores. Keyshops start at £6.51, official stores at £4.29. On PC the keyshop wins on price in most comparisons, but then you are buying a code from a third-party seller, so check the activation region. The price ranks among the lowest we have recorded, cheaper on only 22% of days with data. On PC you buy a key that you activate in Steam or another client, and this is the widest market we track, with more than a quarter of games carrying a keyshop offer.

Release: 01 Nov 1999
Metacritic:
tbd 8.5
Steam:
Overwhelmingly Positive (22k)
Buy in Official Store:
£4.29
Buy in Keyshops:
-8%
£6.51
See price history

Official Stores (4)

DRM:
Steam
Steam
Steam
Half-Life: Opposing Force
Windows
+3
5w ago
DRM:
Steam
Steam
£4.29
Steam
Half-Life 1 Anthology
Windows
+3
4w ago
DRM:
Steam
Steam
£20.06 £11.03
-45%
Steam
Half-Life Complete
Windows
+3
4w ago
DRM:
Steam
Steam
£37.06 £22.22
-40%
Steam
Valve Complete Pack
Windows
+3
4w ago
DRM:
Steam
Steam
£108.12 £97.30
-10%

Keyshops (11)

DRM:
Steam
Steam
G2A
Half-Life: Opposing Force Steam Gift GLOBAL
Windows
+3
22h ago
DRM:
Steam
G2A
£7.08 £6.51
-8%
-8% with G2A8XDDcopy
-8% with G2A8XDDcopy
Difmark
HalfLife Opposing Force (PC)
Windows
+3
3w ago
DRM:
Steam
Difmark
£8.49 ~£7.21
-15%
-15% with XDDEALScopy
-15% with XDDEALScopy
Difmark
Half Life 1 Anthology (PC)
Windows
+3
3w ago
DRM:
Steam
Difmark
£20.06 ~£16.02
-20%
-15% with XDDEALScopy
-15% with XDDEALScopy
CJS-CDKeys
Half-Life 1 Anthology Steam Key (GLOBAL)
Windows
+3
2d ago
DRM:
Steam
CJS-CDKeys
£20.06 £18.02
-10%
G2Play
Half-Life 1 Anthology Steam Gift
Windows
+3
18h ago
DRM:
Steam
G2Play
~£19.96
-8% with XD8DEALScopy
-8% with XD8DEALScopy
Kinguin
Half-Life 1 Anthology Steam Gift
Windows
+3
18h ago
DRM:
Steam
Kinguin
~£19.96
-8% with XD8DEALScopy
-8% with XD8DEALScopy
Difmark
Half Life Complete (PC)
Windows
+3
3w ago
DRM:
Steam
Difmark
£42.84 ~£36.41
-15%
-15% with XDDEALScopy
-15% with XDDEALScopy

Packs (3)

About Half-Life: Opposing Force

Half-Life: Opposing Force - about the game

Half-Life: Opposing Force stands out as a first-person shooter expansion that flips the script on the original Half-Life experience. Released in 1999, this title puts you in the boots of Corporal Adrian Shephard, a soldier from the Hazardous Environment Combat Unit sent to the Black Mesa Research Facility. Your mission starts with containing the chaos, including neutralizing the original protagonist, Gordon Freeman. What unfolds is a gripping narrative filled with intense combat, clever level design, and encounters that build on the sci-fi horror foundation of the series.

Gameplay

In Half-Life: Opposing Force, the core gameplay revolves around first-person shooting mechanics blended with exploration and light puzzle-solving. You navigate through detailed environments, from underground labs to alien-infested zones, using a mix of firearms and improvised tools to survive. Combat feels responsive, with enemies that require strategic approaches, like dodging headcrab leaps or outmaneuvering agile foes. New mechanics include squad interactions, where you can command fellow soldiers for brief alliances, adding a layer of tactical depth without shifting to full team-based play.

The expansion introduces innovative weapons that encourage experimentation. For instance, the barnacle grappling hook lets you latch onto surfaces or enemies for quick traversal, while the displacer cannon offers teleportation effects that can turn the tide in fights. Health and ammo management remain crucial, pushing you to scavenge and adapt on the fly. Levels often feature environmental hazards, such as toxic spills or collapsing structures, which integrate seamlessly into the action.

Game Modes

The primary focus in Half-Life: Opposing Force is its single-player campaign, which delivers a self-contained story across multiple chapters. This mode takes you through a series of missions that parallel events from the original game, offering fresh perspectives on the Black Mesa incident.

Additionally, the game includes a boot camp training mode to familiarize you with controls and basic mechanics before diving into the main story. While it lacks dedicated multiplayer options, the campaign supports replayability through varied difficulty settings and hidden secrets that reward thorough exploration.

Weapons and Enemies

Half-Life: Opposing Force expands the arsenal with unique tools like the shock roach, a living creature that fires electric bolts, and the spore launcher for explosive organic projectiles. These additions complement standard weapons such as the desert eagle and M249 SAW, providing options for different combat styles.

Opponents include familiar Xen aliens alongside new threats from Race X, such as the shock trooper with its homing attacks and the pit drone that burrows underground. Black Ops assassins add human-versus-human tension, with their stealth and agility demanding precise aiming and quick reflexes.

Is It Worth Playing?

For fans of classic first-person shooters, Half-Life: Opposing Force remains a strong recommendation due to its tight design and innovative twists on established formulas. Player reception has held up over time, with many highlighting its engaging story and fresh content as highlights. The game runs well on modern PCs, benefiting from community support that keeps it accessible without major issues.

If you enjoy narrative-driven action with a mix of shooting and problem-solving, this expansion delivers value, especially as a companion to the original Half-Life. It's particularly suited for those who appreciate retro FPS vibes, though newcomers might start with the base game for context. With no ongoing updates or seasons, its appeal lies in the polished, timeless experience it provides.

Interface:
GermanEnglishFrenchKorean

Age rating

Unavailable
Metacritic:
tbd 8.5
Steam:
Overwhelmingly Positive (22k)

Minimum:

Recommended:

Minimum:

Minimum:

Historical low
Price history from official stores
£0.85
Steam
1 months ago
Price history from keyshops
£1.73
G2A
1 months ago

FAQ

9 questions

Before you start looking for a cheap Half-Life: Opposing Force PC key, check the essentials. Developed by Gearbox Software. Published by Valve. PC released date: 01 Nov 1999. Genres: Action. Categories: Multi-player, Valve Anti-Cheat enabled, Family Sharing, Single-player, Custom Volume Controls, Playable without Timed Input, Save Anytime, Adjustable Difficulty.

Q

Where to buy a cheap Half-Life: Opposing Force Steam key or CD key?

Using our price comparison and verified discount codes, you can buy a Half-Life: Opposing Force key for as low as £4.29. This deal is available at Steam and is among the cheapest offers on the market. All keys listed on XD.deals are delivered digitally and eligible for instant download after payment. Prices already include processing fees and applied promo codes, so you always see the lowest Half-Life: Opposing Force price on PC. Check the Half-Life: Opposing Force price history to buy at the best moment.

As of our last update (we refresh Steam pricing multiple times a day), the Half-Life: Opposing Force Steam price is £4.29. You can save an extra ~6% by paying with a discounted Steam gift card.

Our price tracker covers both official retailers and key marketplaces, so you can find Half-Life: Opposing Force on sale even outside seasonal promotions. We currently detect 15 active offers from official stores and keyshops. Check the table above, compare against the historical low, and set an alert so you never miss the next price drop.

Based on our data, Half-Life: Opposing Force is not currently available on GeForce NOW. You will need to run it locally on your PC. Browse games available on GeForce NOW.

The cheapest offer came most often from Kinguin: 72 of 142 days with data. Half of all readings fell between £6.86 and £319.09. The spread between offers was wide: from £0.85 to £362.12. The current price ranks among the lowest we have seen: it was cheaper on only 22% of days with data.

Yes. Half-Life: Opposing Force has an official page on the Steam Store. You can also buy a Half-Life: Opposing Force Steam key from third-party sellers. Our price comparison currently includes 15 offers with Steam DRM. Pick one to ensure your Half-Life: Opposing Force download happens on Valve's platform.

Yes, with minor tweaks. Half-Life: Opposing Force is Steam Deck Playable - it works after small adjustments like selecting a Proton version or using the touchscreen for tiny launcher text. You can play Half-Life: Opposing Force on Steam Deck.

According to our data Half-Life: Opposing Force is not currently available on PC Game Pass, EA Play or Ubisoft+. We are still filling in the catalogues of these services, so it is worth confirming the status at the source before you decide. If you are buying, XD.deals will help you find the lowest price.

No - XD.deals is not a store. We are a price-comparison service that tracks the best Half-Life: Opposing Force deals across official stores and verified keyshops. Click "Go to Store" next to any offer and you will be redirected to the retailer's website to complete your purchase.

Best prices for Half-Life: Opposing Force

1 Steam Steam Official
£4.29
2 G2A G2A Keyshop
-8% £6.51
3 Difmark Difmark Keyshop
-15% £7.21
4 CJS-CDKeys CJS-CDKeys Keyshop
-10% £18.02
5 G2Play G2Play Keyshop
£19.96

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