Games like Half-Life: Opposing Force on Steam

For those who prefer not to search, lists of the most played, top deals and best free games like Half-Life: Opposing Force are available at the bottom of the page.

Filters & Lists

Shadow Warrior Classic (1997)

Strap on your combat sandals...Lo Wang is coming to the Land of the Rising Sun to turn out the lights. Experience total blood immersion. If you can't touch, kill or drive something...then blow it away! Whether you're wielding shurikens, an Uzi, or a freshly plundered Guardian head...you've got your work cut out for you.

Similarity 58%
Price Free to play
Rating 8.8
Release -

Another World – 20th Anniversary Edition

Also known as Out Of This World™, Another World is a pioneer action/platformer that released across more than a dozen platforms since its debut in 1991. Along the years, Another World™ has attained cult status among critics and sophisticated gamers alike.

Similarity 58%
Price 9.99€
Rating 8.0
Release 04 Apr 2013

Sudeki

Sudeki, a world torn apart into light, shadow and dark. Rent asunder by deceit and betrayal, the land cries out for a peace that only four united heroes can bring. Beyond the protective walls of Illumina Castle lie miles of pastoral, rolling countryside, though once a serene landscape, the Aklorian forces have transformed the countryside...

Similarity 58%
Price 5.99€
Rating 8.4
Release 24 Feb 2014

POSTAL 2

Live a week in the life of "The POSTAL Dude"; a hapless everyman just trying to check off some chores. Buying milk, returning an overdue library book, getting Gary Coleman's autograph, what could possibly go wrong?

Similarity 58%
Price -90% 1.00€
Rating 9.5
Release 02 Nov 2012

Thief™ II: The Metal Age

The ultimate thief is back! Tread softly as you make your way through 15 new complex, non-linear levels full of loot to steal and guards to outsmart. Improved enemy AI, new gadgets and a riveting story will draw you into the world of Thief™ II: The Metal Age, a place of powerful new technologies, fanatical religions and corruption.

Similarity 58%
Price 6.99€
Rating 9.0
Release 22 May 2012

Sanctum 2

Sanctum 2 is the sequel to the world’s first Tower Defense/FPS hybrid game. Pick from four unique character classes and embark on a mission to protect the oxygen-producing Cores from hordes of deadly aliens who are threatened by their existence.

Similarity 58%
Price 14.79€
Rating 8.8
Release 15 May 2013

Call of Duty: United Offensive

Award-winning developer Gray Matter Interactive follows up on the success of Infinity Ward's Call of Duty™ - winner of over 80 Game of the Year and 50 Editors' Choice awards worldwide - with Call of Duty™: United Offensive™.

Similarity 58%
Price 19.99€
Rating 8.3
Release 13 Oct 2006

Red Orchestra: Ostfront 41-45

Fight in the theatre of war that changed the world forever. Battle alongside your compatriots on some of the most inhospitable environments of the Eastern Front in Red Orchestra: Ostfront 41-45. Red Orchestra places you in the most realistic WWII first-person multi-player combat to date on the PC, allowing the player to fight through...

Similarity 58%
Price 3.99€
Rating 8.4
Release 14 Mar 2006

Warhammer 40,000: Boltgun

Load up your Boltgun and unleash the awesome Space Marine arsenal to blast your way through an explosion of sprites, pixels and blood in a perfect blend of Warhammer 40,000, frenetic gameplay and the stylish visuals of 90’s retro shooters.

Similarity 57%
Price -40% 13.25€
Rating 8.9
Release 23 May 2023

Cyberpunk 2077

Cyberpunk 2077 is an open-world, action-adventure RPG set in the dark future of Night City — a dangerous megalopolis obsessed with power, glamor, and ceaseless body modification.

Similarity 57%
Price 59.99€
Rating 8.4
Release 09 Dec 2020

Hellbound

Classic First Person Shooter style game. Like the good old days. An action game focused on speed, gore, guns, and metal music. Inspired by the 90s’ classics with modern visuals and audio!

Similarity 57%
Price 14.79€
Rating 6.3
Release 04 Aug 2020

The Outer Worlds

The Outer Worlds is an award-winning single-player RPG from Obsidian Entertainment and Private Division. As you explore a space colony, the character you decide to become will determine how this player-driven story unfolds. In the colony's corporate equation, you are the unplanned variable.

Similarity 57%
Price 29.99€
Rating 8.2
Release 23 Oct 2020

TOXIKK™

FRAG LIKE IT'S 1999! TOXIKK plays as if today's military shooters never existed: Designed as a spiritual successor to the FPS giants of the late 90s and early 2ks, TOXIKK carefully evolves their mechanics with modern technology and fresh ideas elaborated with Arena-FPS enthusiasts.

Similarity 57%
Price Free to play
Rating 7.5
Release 10 Sep 2016

DeadCore

DeadCore is a Platformer-FPS blending exploration and speedrun. Become immersed in a futuristic and dreamlike adventure which will see you climb a huge Tower born from the void and truly put your capabilities to the test. Will you be able to reveal the secrets that lie beneath this fog-ridden world?

Similarity 57%
Price -69% 3.10€
Rating 8.2
Release 17 Oct 2014

ARMA: Cold War Assault

Bohemia Interactive's debut game published by Codemasters as Operation Flashpoint in 2001, became genre-defining combat military simulation and the No. 1 bestselling PC game around the world and has won many international awards, including “Game of The Year” and “Best Action Game”. Over 2 million copies have been sold since its release.

Similarity 57%
Price -80% 0.99€
Rating 7.8
Release 08 Aug 2011

Dead Space (2008)

You are Isaac Clarke, an engineer on the spacecraft USG Ishimura. You're not a warrior. You're not a soldier. You are, however, the last line of defense for the remaining living crew.

Similarity 57%
Price 19.99€
Rating 9.0
Release 09 Jan 2009

STAR WARS™: Dark Forces Remaster

The evil Empire is currently creating a doomsday army behind a veil of secrecy. However, they are no match for the Rebel Alliance's covert operations division. Your mission is to infiltrate the Empire and put an end to their plans for terror and domination.

Similarity 57%
Price -45% 15.94€
Rating 8.5
Release 28 Feb 2024

Alien Removal Division

The invasion has started and the secret military research facility has fallen leaving only chaos. As the only survivor, you must fight your way through the military base against a horde of frantic aliens. A.R.D. is a FREE single-player first-person shooter made by students from Breda University.

Similarity 57%
Price Free to play
Rating 8.4
Release 17 Jun 2022

Fobia - St. Dinfna Hotel

Explore a decadent hotel across different timelines and uncover the dark history of a fanatical cult and your role in their plans.

Similarity 57%
Price -91% 2.34€
Rating 8.2
Release 28 Jun 2022

Mecha Knights: Nightmare

Mecha action shooter, plunging the player into an apocalyptic war. Engage in epic battles with endless hordes of monsters in your powerful customizable mechs.

Similarity 57%
Price 15.79€
Rating 8.7
Release 30 Aug 2021

Atomfall

A nuclear disaster has left an area of Britain in tatters. Atomfall, a new survival-action game, will see you explore, scavenge, craft, barter and fight your way through beautifully recreated scenery in search of answers.

Similarity 57%
Price -41% 35.39€
Rating 7.6
Release 27 Mar 2025

Atomic Heart

In a mad and sublime utopian world, take part in explosive encounters. Adapt your fighting style to each opponent, use your environment and upgrade your equipment to fulfill your mission. If you want to reach the truth, you'll have to pay in blood.

Similarity 57%
Price -69% 18.50€
Rating 8.1
Release 20 Feb 2023

This Strange Realm Of Mine

This Strange Realm Of Mine is a First Person Shooter mixed with poetry and psychological horror. Graphic style is 3D mixed with pixel art.

Similarity 57%
Price 9.75€
Rating 7.8
Release 19 Jul 2017

Duck Season

The game of your dreams just dropped, DUCK SEASON, a hunter with ridiculous graphics. Luckily, it's summer vacation and Mom just surprised you with a one day rental of it! Unfortunately, as you binge play it becomes apparent that all is not right with Duck Season...

Similarity 57%
Price 19.50€
Rating 8.1
Release 14 Sep 2017

Most played games like Half-Life: Opposing Force on Steam

Take a look at the top games like Half-Life: Opposing Force that are currently attracting the largest player bases on the Steam platform, as of May 01st 2025.

1. Red Dead Redemption 2

Similarity 59% Winner of over 175 Game of the Year Awards and recipient of over 250 perfect scores, RDR2 is the epic tale of outlaw Arthur Morgan and the infamous Van der Linde gang, on the run across America at the dawn of the modern age. Also includes access to the shared living world of Red Dead Online. Red Dead Redemption 2 is a open world, story rich and western game developed and published by Rockstar Games. Released on December 05th 2019 has received 717,516 reviews of which 661,377 were positive and 56,139 were negative resulting in an impressive rating of 9.1 out of 10. The game has hit the top spot as the #1 most played game like Half-Life: Opposing Force, thanks to its 23,553 peak concurrent players over the last day.
9.1
661,377
56,139

23,553
players

2. Cyberpunk 2077

Similarity 57% Cyberpunk 2077 is an open-world, action-adventure RPG set in the dark future of Night City — a dangerous megalopolis obsessed with power, glamor, and ceaseless body modification. Cyberpunk 2077 is a cyberpunk and open world game developed and published by CD PROJEKT RED. Released on December 09th 2020 has received 834,940 reviews of which 703,079 were positive and 131,861 were negative resulting in a rating of 8.4 out of 10. While seeing 17,917 players online at once in the last 24 hours, this game is currently ranked #2 among games like Half-Life: Opposing Force based on player count.
8.4
703,079
131,861

17,917
players

3. Fallout 4

Similarity 64% Bethesda Game Studios, the award-winning creators of Fallout 3 and The Elder Scrolls V: Skyrim, welcome you to the world of Fallout 4 – their most ambitious game ever, and the next generation of open-world gaming. Fallout 4 is a open world, post-apocalyptic and singleplayer game developed by Bethesda Game Studios and published by Bethesda Softworks. Released on November 09th 2015 has received 390,364 reviews of which 324,290 were positive and 66,074 were negative resulting in a rating of 8.2 out of 10. While seeing 12,186 players online at once in the last 24 hours, this game is currently ranked #3 among games like Half-Life: Opposing Force based on player count.
8.2
324,290
66,074

12,186
players

4. Halo: The Master Chief Collection

Similarity 80% The Master Chief’s iconic journey includes six games, built for PC and collected in a single integrated experience. Whether you’re a long-time fan or meeting Spartan 117 for the first time, The Master Chief Collection is the definitive Halo gaming experience. Halo: The Master Chief Collection is a great soundtrack, fps and classic game developed by 343 Industries, Splash Damage, Ruffian Games, Bungie and Saber Interactive and published by Xbox Game Studios. Released on December 03rd 2019 has received 240,453 reviews of which 222,169 were positive and 18,284 were negative resulting in an impressive rating of 9.1 out of 10. With 4,897 concurrent players in the last 24 hours, the game currently holds the #4 spot among the most played games like Half-Life: Opposing Force.
9.1
222,169
18,284

4,897
players

5. Fallout: New Vegas

Similarity 63% Welcome to Vegas. New Vegas. Enjoy your stay! Fallout: New Vegas is a open world, rpg and post-apocalyptic game developed by Obsidian Entertainment and published by Bethesda Softworks. Released on October 21st 2010 has received 226,078 reviews of which 217,239 were positive and 8,839 were negative resulting in an impressive rating of 9.5 out of 10. With 4,346 concurrent players in the last 24 hours, the game currently holds the #5 spot among the most played games like Half-Life: Opposing Force.
9.5
217,239
8,839

4,346
players

6. Call of Duty®: Black Ops III

Similarity 62% Call of Duty®: Black Ops III Zombies Chronicles Edition includes the full base game plus the Zombies Chronicles content expansion. Call of Duty®: Black Ops III is a multiplayer, zombies and fps game developed by Treyarch and Aspyr (Mac) and published by Aspyr (Mac) and Activision. Released on November 05th 2015 has received 213,641 reviews of which 180,012 were positive and 33,629 were negative resulting in a rating of 8.3 out of 10. With 4,001 concurrent players in the last 24 hours, the game currently holds the #6 spot among the most played games like Half-Life: Opposing Force.
8.3
180,012
33,629

4,001
players

7. S.T.A.L.K.E.R. 2: Heart of Chornobyl

Similarity 56% Discover the vast Chornobyl Exclusion Zone full of dangerous enemies, deadly anomalies and powerful artifacts. Unveil your own epic story as you make your way to the Heart of Chornobyl. Make your choices wisely, as they will determine your fate in the end. S.T.A.L.K.E.R. 2: Heart of Chornobyl is a open world, fps and post-apocalyptic game developed by GSC Game World and published by GSC Game World (worldwide), SEGA (Japan) and 4divinity (China and South East Asia). Released on November 20th 2024 has received 111,487 reviews of which 90,084 were positive and 21,403 were negative resulting in a rating of 8.0 out of 10. With 2,548 concurrent players in the last 24 hours, the game currently holds the #7 spot among the most played games like Half-Life: Opposing Force.
8.0
90,084
21,403

2,548
players

8. Halo Infinite

Similarity 68% From one of gaming's most iconic sagas, Halo is bigger than ever. Featuring an expansive open-world campaign and a dynamic free to play multiplayer experience. Halo Infinite is a free to play, fps and multiplayer game developed by 343 Industries and published by Xbox Game Studios. Released on November 15th 2021 has received 176,400 reviews of which 123,072 were positive and 53,328 were negative resulting in a rating of 6.9 out of 10. With 2,429 concurrent players in the last 24 hours, the game currently holds the #8 spot among the most played games like Half-Life: Opposing Force.
6.9
123,072
53,328

2,429
players

9. Mass Effect™ Legendary Edition

Similarity 56% The Mass Effect™ Legendary Edition includes single-player base content and over 40 DLC from the highly acclaimed Mass Effect, Mass Effect 2, and Mass Effect 3 games, including promo weapons, armors, and packs — remastered and optimized for 4K Ultra HD. Mass Effect™ Legendary Edition is a story rich, rpg and choices matter game developed by BioWare and published by Electronic Arts. Released on May 14th 2021 has received 55,425 reviews of which 50,469 were positive and 4,956 were negative resulting in a rating of 9.0 out of 10. With 2,369 concurrent players in the last 24 hours, the game currently holds the #9 spot among the most played games like Half-Life: Opposing Force.
9.0
50,469
4,956

2,369
players

10. Metro 2033 Redux

Similarity 64% In 2013 the world was devastated by an apocalyptic event, annihilating almost all mankind and turning the Earth's surface into a poisonous wasteland. A handful of survivors took refuge in the depths of the Moscow underground, and human civilization entered a new Dark Age. The year is 2033. Metro 2033 Redux is a post-apocalyptic, fps and atmospheric game developed by 4A Games and published by Deep Silver. Released on August 27th 2014 has received 103,741 reviews of which 94,593 were positive and 9,148 were negative resulting in a rating of 9.0 out of 10. With 2,217 concurrent players in the last 24 hours, the game currently holds the #10 spot among the most played games like Half-Life: Opposing Force.
9.0
94,593
9,148

2,217
players

Best deals on games like Half-Life: Opposing Force on Steam

Discover fantastic savings with the best discounts on a variety of games like Half-Life: Opposing Force available on Steam right now, updated on May 01st 2025. Looking for even more deals? Use the search filters to explore a wider range of discounted games like Half-Life: Opposing Force.

1. My Friendly Neighborhood

Similarity 55% Something scary is happening with everyone's favorite Saturday morning puppet show, The Friendly Neighborhood! Play as Gordon, a repairman sent to get to the bottom of this disturbing dilemma. Fend off puppets and solve puzzles in this survival horror adventure. My Friendly Neighborhood is a singleplayer, survival horror and funny game developed by John Szymanski and Evan Szymanski and published by DreadXP. Released on July 18th 2023 has received 2,732 reviews of which 2,613 were positive and 119 were negative resulting in an impressive rating of 9.1 out of 10. Featuring a massive 96% discount, this game currently holds the #1 spot in the best deals for games like Half-Life: Opposing Force.
9.1
2,613
119

-96% 32.50€ 1.30€

2. Prodeus

Similarity 68% Prodeus is a first-person shooter of old, re-imagined using modern rendering techniques and technology. Experience the quality you’d expect from a modern AAA game, designed with retro aesthetics and gameplay that invoke the tech-imposed limits of older hardware. Prodeus is a boomer shooter, fps and retro game developed by Bounding Box Software Inc. and published by Humble Games. Released on September 23rd 2022 has received 7,473 reviews of which 6,947 were positive and 526 were negative resulting in an impressive rating of 9 out of 10. Thanks to its incredible 95% discount, this game is now the #2 best deal in games like Half-Life: Opposing Force.
9
6,947
526

-95% 25.00€ 1.25€

3. Borderlands: The Pre-Sequel

Similarity 58% Launch into the Borderlands universe and shoot ‘n’ loot your way through a brand new adventure that rockets you onto Pandora’s moon in Borderlands: The Pre-Sequel! Borderlands: The Pre-Sequel is a looter shooter, co-op and fps game developed by 2K Australia, Gearbox Software and Aspyr (Linux) and published by Aspyr (Linux) and 2K. Released on October 16th 2014 has received 41,307 reviews of which 33,563 were positive and 7,744 were negative resulting in a rating of 8 out of 10. Thanks to its incredible 93% discount, this game is now the #3 best deal in games like Half-Life: Opposing Force.
8
33,563
7,744

-93% 42.00€ 2.94€

4. F.E.A.R. 3

Similarity 64% F.E.A.R. 3 delivers all the hallmarks that define the F.E.A.R. brand: terrifying paranormal experience, frenetic combat and a dramatic storyline. F.E.A.R. 3 is a fps, horror and co-op game developed by Day 1 Studios and published by Warner Bros. Interactive Entertainment. Released on June 21st 2011 has received 12,665 reviews of which 9,019 were positive and 3,646 were negative resulting in a rating of 7 out of 10. Currently offered at a significant 93% discount, this title has earned the #4 position in the best deals for games like Half-Life: Opposing Force.
7
9,019
3,646

-93% 19.71€ 1.38€

5. INDUSTRIA

Similarity 63% Embark on a gripping journey in INDUSTRIA, an atmospheric FPS set in Cold War-era East Berlin. Unravel the secrets of a mysterious parallel dimension while searching for a missing colleague. Explore a haunting reality where the truth awaits. Discover the dark past that lies beyond. INDUSTRIA is a fps, action and sci-fi game developed by Bleakmill and published by Headup. Released on September 30th 2021 has received 3,200 reviews of which 2,273 were positive and 927 were negative resulting in a rating of 6.9 out of 10. Currently offered at a significant 93% discount, this title has earned the #5 position in the best deals for games like Half-Life: Opposing Force.
6.9
2,273
927

-93% 20.29€ 1.42€

6. Marvel's Guardians of the Galaxy

Similarity 54% Fire up a wild ride across the cosmos with a fresh take on Marvel’s Guardians of the Galaxy. In this action-adventure game, you are Star-Lord leading the unpredictable Guardians from one explosion of chaos to the next. You got this. Probably. Marvel's Guardians of the Galaxy is a singleplayer, story rich and action game developed by Eidos-Montréal and published by Eidos Interactive Corp.. Released on October 26th 2021 has received 38,718 reviews of which 36,453 were positive and 2,265 were negative resulting in an impressive rating of 9.2 out of 10. Currently offered at a significant 92% discount, this title has earned the #6 position in the best deals for games like Half-Life: Opposing Force.
9.2
36,453
2,265

-92% 62.38€ 4.99€

7. Metro 2033 Redux

Similarity 64% In 2013 the world was devastated by an apocalyptic event, annihilating almost all mankind and turning the Earth's surface into a poisonous wasteland. A handful of survivors took refuge in the depths of the Moscow underground, and human civilization entered a new Dark Age. The year is 2033. Metro 2033 Redux is a post-apocalyptic, fps and atmospheric game developed by 4A Games and published by Deep Silver. Released on August 27th 2014 has received 103,741 reviews of which 94,593 were positive and 9,148 were negative resulting in a rating of 9.0 out of 10. Currently offered at a significant 92% discount, this title has earned the #7 position in the best deals for games like Half-Life: Opposing Force.
9.0
94,593
9,148

-92% 18.75€ 1.50€

8. Fobia - St. Dinfna Hotel

Similarity 57% Explore a decadent hotel across different timelines and uncover the dark history of a fanatical cult and your role in their plans. Fobia - St. Dinfna Hotel is a indie, survival horror and violent game developed by Pulsatrix Studios and published by Maximum Entertainment. Released on June 28th 2022 has received 1,922 reviews of which 1,646 were positive and 276 were negative resulting in a rating of 8.2 out of 10. Currently offered at a significant 91% discount, this title has earned the #8 position in the best deals for games like Half-Life: Opposing Force.
8.2
1,646
276

-91% 26.00€ 2.34€

9. Deus Ex: Mankind Divided

Similarity 64% Now an experienced covert operative, Adam Jensen is forced to operate in a world that has grown to despise his kind. Armed with a new arsenal of state-of-the-art weapons and augmentations, he must choose the right approach, along with who to trust, in order to unravel a vast worldwide conspiracy. Deus Ex: Mankind Divided is a cyberpunk, stealth and rpg game developed by Eidos Montreal and Feral Interactive (Linux) and published by Feral Interactive (Linux), Feral interactive (Mac) and Eidos Interactive Corp.. Released on August 23rd 2016 has received 40,713 reviews of which 30,916 were positive and 9,797 were negative resulting in a rating of 7.5 out of 10. Currently offered at a significant 91% discount, this title has earned the #9 position in the best deals for games like Half-Life: Opposing Force.
7.5
30,916
9,797

-91% 30.56€ 2.75€

10. POSTAL 2

Similarity 58% Live a week in the life of "The POSTAL Dude"; a hapless everyman just trying to check off some chores. Buying milk, returning an overdue library book, getting Gary Coleman's autograph, what could possibly go wrong? POSTAL 2 is a violent, dark humor and open world game developed and published by Running With Scissors. Released on November 02nd 2012 has received 114,567 reviews of which 110,950 were positive and 3,617 were negative resulting in an impressive rating of 9.5 out of 10. Currently offered at a significant 90% discount, this title has earned the #10 position in the best deals for games like Half-Life: Opposing Force.
9.5
110,950
3,617

-90% 10.00€ 1.00€

Free games like Half-Life: Opposing Force on Steam

Check out this fantastic list of free-to-play games like Half-Life: Opposing Force you can enjoy on Steam right now, updated on May 01st 2025. Looking for even more free titles? Use the search filters to explore a wider range of free to play games like Half-Life: Opposing Force.

1. Halo Infinite

Similarity 68% From one of gaming's most iconic sagas, Halo is bigger than ever. Featuring an expansive open-world campaign and a dynamic free to play multiplayer experience. Halo Infinite is a free to play, fps and multiplayer game developed by 343 Industries and published by Xbox Game Studios. Released on November 15th 2021 has received 176,400 reviews of which 123,072 were positive and 53,328 were negative resulting in a rating of 6.9 out of 10. With 2,429 active players enjoying it for free, this strategy game has reached the #1 spot among the top free games like Half-Life: Opposing Force.
6.9
123,072
53,328

2,429
players

2. Quake Champions

Similarity 59% Step into the Arena. Compete against players from around the world in this fast-paced shooter that combines the dark mythos of the original Quake with the skill-based competition of Quake III Arena. Become a Champion. Quake Champions is a arena shooter, hero shooter and early access game developed by id Software and published by Bethesda Softworks. Released on August 18th 2022 has received 38,296 reviews of which 28,247 were positive and 10,049 were negative resulting in a rating of 7.3 out of 10. Thanks to its free to play tag and a daily player base of 218, this game has secured the #2 spot in the ranking of free games like Half-Life: Opposing Force.
7.3
28,247
10,049

218
players

3. America's Army: Proving Grounds

Similarity 55% America’s Army: Proving Grounds is the official game of the U.S. Army and part of the highly acclaimed America’s Army game series. This free military game focuses on small unit tactical maneuvers and puts you to the test in a wide variety of new America’s Army maps and AA fan favorites. America's Army: Proving Grounds is a free to play, fps and action game developed and published by U.S. Army. Released on August 29th 2013 has received 10,925 reviews of which 8,617 were positive and 2,308 were negative resulting in a rating of 7.7 out of 10. Thanks to its free to play tag and a daily player base of 171, this game has secured the #3 spot in the ranking of free games like Half-Life: Opposing Force.
7.7
8,617
2,308

171
players

4. TOXIKK™

Similarity 57% FRAG LIKE IT'S 1999! TOXIKK plays as if today's military shooters never existed: Designed as a spiritual successor to the FPS giants of the late 90s and early 2ks, TOXIKK carefully evolves their mechanics with modern technology and fresh ideas elaborated with Arena-FPS enthusiasts. TOXIKK™ is a fps, action and free to play game developed by Reakktor Studios and published by Schwiezer System GmbH. Released on September 10th 2016 has received 5,795 reviews of which 4,472 were positive and 1,323 were negative resulting in a rating of 7.5 out of 10. Attracting a solid base of 144 players due to its free access, this strategy game has achieved the #4 position in the best free games like Half-Life: Opposing Force.
7.5
4,472
1,323

144
players

5. Classic Marathon

Similarity 61% From the team that brought you Aleph One, the classic sci-fi FPS Marathon from Bungie on Mac revived for modern hardware by the fan community. Classic Marathon is a fps, shooter and pvp game developed and published by Aleph One Developers. Released on May 10th 2024 has received 883 reviews of which 812 were positive and 71 were negative resulting in a rating of 8.7 out of 10. The game currently holds the #5 spot among the most played free games like Half-Life: Opposing Force.
8.7
812
71

18
players

6. The Lab

Similarity 60% Welcome to The Lab, a compilation of Valve’s room-scale VR experiments set in a pocket universe within Aperture Science. Fix a robot, defend a castle, adopt a mechanical dog, and more. Still not sold? It’s free! The Lab is a free to play, vr and singleplayer game developed and published by Valve. Released on April 05th 2016 has received 6,347 reviews of which 6,030 were positive and 317 were negative resulting in an impressive rating of 9.2 out of 10. The game currently holds the #6 spot among the most played free games like Half-Life: Opposing Force.
9.2
6,030
317

11
players

7. BRINK

Similarity 58% You decide the combat role you want to assume in the world of Brink as you fight to save yourself and mankind’s last refuge! BRINK is a fps, action and multiplayer game developed by Splash Damage and published by Bethesda Softworks. Released on May 09th 2011 has received 7,923 reviews of which 4,980 were positive and 2,943 were negative resulting in a rating of 6.2 out of 10. The game currently holds the #7 spot among the most played free games like Half-Life: Opposing Force.
6.2
4,980
2,943

9
players

8. Quake II RTX

Similarity 60% Quake II RTX is a cutting-edge, ray-traced reimagining of id software’s old school classic, by NVIDIA’s Lightspeed Studios. Global lighting effects, including realistic reflections, refraction, shadows, ambient occlusion and global illumination are a result of the path-traced simulation of light. Quake II RTX is a free to play, action and fps game developed by Lightspeed Studios™ and published by NVIDIA. Released on June 06th 2019 has received 4,568 reviews of which 3,993 were positive and 575 were negative resulting in a rating of 8.5 out of 10. The game currently holds the #8 spot among the most played free games like Half-Life: Opposing Force.
8.5
3,993
575

6
players

9. Transmissions: Element 120

Similarity 60% TE120 is a short single player experience set in the Half-Life Universe featuring a gravity defying weapon that allows you to jump buildings and sustain large falls. The story takes place at a mysterious date & location. Where are you? Why have you been sent? Transmissions: Element 120 is a free to play, action and shooter game developed by Shokunin, Thomas M. Visser and Vincent Thiele and published by Self published. Released on June 16th 2016 has received 9,786 reviews of which 9,248 were positive and 538 were negative resulting in an impressive rating of 9.2 out of 10. The game currently holds the #9 spot among the most played free games like Half-Life: Opposing Force.
9.2
9,248
538

4
players

10. Nirvana

Similarity 56% Wake up and embrace your new powers. In this Bullet Hell Fast-FPS, dare to take on mystical creatures to defeat the God Raj. Nirvana awaits... Nirvana is a action, adventure and platformer game developed by Mastoc Studio and published by ESMA - Ecoles Creatives. Released on February 01st 2025 has received 370 reviews of which 345 were positive and 25 were negative resulting in a rating of 8.6 out of 10. The game currently holds the #10 spot among the most played free games like Half-Life: Opposing Force.
8.6
345
25

2
players