Single-player games like Half-Life: Opposing Force
Below are 20 single-player Steam games similar to Half-Life: Opposing Force, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Half-Life: Opposing Force page.
Ranked picks
- 1
Half-Life: Blue Shift
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Made by Gearbox Software and originally released in 2001 as an add-on to Half-Life, Blue Shift is a return to the Black Mesa Research Facility in which you play as Barney Calhoun, the security guard sidekick who helped Gordon out of so many sticky situations.
- 2
Half-Life
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Named Game of the Year by over 50 publications, Valve's debut title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world.
- 3
Half-Life 2
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Reawakened from stasis in the occupied metropolis of City 17, Gordon Freeman is joined by Alyx Vance as he leads a desperate human resistance. Experience the landmark first-person shooter packed with immersive world-building, boundary-pushing physics, and exhilarating combat.
- 4
Synthesis of Corruption
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Emergency Protocol activated: Dark Energy Particle Synthesis failed. Now you – late and alone – must navigate a facility where science and sanity have collapsed. Face entities born from the corruption of dark energy in this atmospheric FPS-horror hybrid, where human ambition meets primal terror.
- 5
Starship Troopers: Ultimate Bug War!
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Lock and load into the Starship Troopers universe and join the Mobile Infantry in the most realistic depiction of war ever made! Experience an original story in this action-packed, first-person retro shooter. Would you like to know more?
- 6
Crysis Warhead®
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Pulse-racing new installment from 2007's PC Game of the Year*: Play as Sergeant Sykes and experience a whole new side of the battle. A standard combat mission behind enemy lines becomes critical when you discover your enemies have captured something of vital importance to the ensuing war.
- 7
Alien: Rogue Incursion Evolved Edition
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
A new action-horror story set in the iconic Alien universe. Play as rogue Colonial Marine Zula Hendricks, sent to investigate a blacksite on Purdan. Fight and survive using your skill, reflexes, and determination against a deadly Xenomorph incursion in this gripping first chapter of a two-part saga.
- 8
Duke Nukem 3D: 20th Anniversary World Tour
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Frag like it’s 1996 – this time with even more asses to kick! Join the world’s greatest action hero in Duke Nukem 3D: 20th Anniversary World Tour as he saves Earth once again, kicking alien ass and saving babes across the globe along the way.
- 9
System Shock® 2 (1999)
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
"Remember, it is my will that guided you here. It is my will that gave you your cybernetic implants, the only beauty in that meat you call a body. If you value that meat... you will do as I tell you." The cult classic sci-fi horror FPS-RPG has returned.
- 10
Resident Evil: Operation Raccoon City
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Experience the Fear: Set in the terrifying world of Resident Evil.
- 11
Resident Evil 3
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Jill Valentine is one of the last remaining people in Raccoon City to witness the atrocities Umbrella performed. To stop her, Umbrella unleashes their ultimate secret weapon: Nemesis! Also includes Resident Evil Resistance, a new 1 vs 4 online multiplayer game set in the Resident Evil universe.
- 12
XCOM: Enemy Unknown
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required.
The XCOM: Enemy Unknown - Slingshot Pack is Now Available!
- 13
Dishonored
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Dishonored is an immersive first-person action game that casts you as a supernatural assassin driven by revenge. With Dishonored’s flexible combat system, creatively eliminate your targets as you combine the supernatural abilities, weapons and unusual gadgets at your disposal.
- 14
Borderlands 2
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
The Ultimate Vault Hunter’s Upgrade lets you get the most out of the Borderlands 2 experience.
- 15
Borderlands 3
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
The original shooter-looter returns, packing bazillions of guns and a mayhem-fueled adventure! Blast through new worlds and enemies as one of four new Vault Hunters.
- 16
Borderlands 4
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Borderlands 4 is a mayhem-fueled looter shooter, jam-packed with billions of weapons, deadly enemies, and intense co-op action. Break free from a dangerous hidden planet as one of four new badass Vault Hunters.
- 17
Borderlands: The Pre-Sequel
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
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!
- 18
Borderlands Game of the Year
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Get ready for the mind blowing insanity! Play as one of four trigger-happy mercenaries and take out everything that stands in your way! With its addictive action, frantic first-person shooter combat, massive arsenal of weaponry, RPG elements and four-player co-op, Borderlands is a breakthrough experience that challenges all the...
- 19
Borderlands Game of the Year Enhanced
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Discover the original co-op shooter-looter, crammed with new enhancements! As one of 4 trigger-happy mercenaries with RPG progression, equip bazillions of guns to take on the desert planet Pandora.
- 20
Tiny Tina's Wonderlands
Single-player alternative to Half-Life: Opposing Force — playable solo, no multiplayer required. Shares Action with Half-Life: Opposing Force.
Embark on an epic adventure full of whimsy, wonder, and high-powered weaponry! Roll your own multiclass hero then shoot, loot, slash, and cast on a quest to stop the Dragon Lord.