Top similar games like Half-Life: Opposing Force:

Winner of over 50 Game of the Year awards, Half-Life set new standards for action games when it was released in 1998. Half-Life: Source is a digitally remastered version of the critically acclaimed and best selling PC game, enhanced via Source technology to include physics simulation, enhanced effects, and more.

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.

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.

1998. HALF-LIFE sends a shock through the game industry with its combination of pounding action and continuous, immersive storytelling. Valve's debut title wins more than 50 game-of-the-year awards on its way to being named "Best PC Game Ever" by PC Gamer, and launches a franchise with more than eight million retail units sold worldwide.

Half-Life® 2: Episode Two is the second in a trilogy of new games created by Valve that extends the award-winning and best-selling Half-Life® adventure. As Dr. Gordon Freeman, you were last seen exiting City 17 with Alyx Vance as the Citadel erupted amidst a storm of unknown proportions.

Half-Life 2 has sold over 4 million copies worldwide, and earned over 35 Game of the Year Awards. Episode One is the first in a series of games that reveal the aftermath of Half-Life 2 and launch a journey beyond City 17. Also features two multiplayer games. Half-Life 2 not required.

Mankind is at war with the Strogg, a hostile alien race planning an invasion of Earth. In response, we launched a preemptive strike...it failed. Outnumbered and outgunned, you must fight to shut down the enemy's war machine. Only then will the fate of humanity be known.

Re-discover what made System Shock the first of it's kind, a ground breaking immersive sim that would inspire a generation of games to come....

Relive Half-Life.

Your prison ship has crash-landed on the fastest, sleekest, most dangerous 3D world ever created. Look around, crystal clear water shimmers, shadows dance and shift, alien architecture fades into the horizon.

You are in control of X-COM: an organization formed by the world's governments to fight the ever-increasing alien menace.

The Longest Journey is an amazing graphical adventure, where the player controls the protagonist, April Ryan, on her journey between parallel universes.

Halo Wars: Definitive Edition is an enhanced version of the real-time strategy classic, Halo Wars, updated to run natively on PC. Halo Wars: Definitive Edition includes improved graphics, new achievements and all of the DLC created for the landmark real-time strategy game.

What began as a conflict over the transfer of consciousness from flesh to machines escalated into a war which has decimated a million worlds. The Core and the Arm have all but exhausted the resources of a galaxy in their struggle for domination.

Two New, 32-Level DOOM II Episodes. Evilution: Far from earth, the UAC recommenced their experiments on on of the moons of Jupiter. A spaceship, mistaken for a supply vexxel on radar, hovered above the base. Hideous demons poured out, blanketing the base with death. All your comrades were quickly slaughtered or zombified.

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.

Adapt to Survive — An epic story thrusts players into an ever-changing environment, forcing them to adapt their tactics and approach to conquer battlefields ranging from newly frozen jungle to zero-gravity alien environments. Suit up! — A high-tech Nanosuit allows gamers to augment their abilities in real time on the battlefield.

A world where time has no meaning - and evil knows no bounds. Torn from a world long gone, the time traveling warrior Turok has found himself thrust into a savage land torn by conflict.

Originally planned as a section of the Highway 17 chapter of Half-Life 2, Lost Coast is a playable technology showcase that introduces High Dynamic Range lighting to the Source engine.

Long after the passing of the Second Shadow, when dragons ruled the twilight sky and the stars were bright and numerous, came the Age of the Great Guilds. Blacksmiths. Shepherds. Clerics. Each dedicated to the absolute control of secret knowledge. Another such Guild was the Weavers.

Discover who — or what — is behind the mysterious accidents in a house full of secrets!

Experience the epic space strategy games that redefined the RTS genre. Control your fleet and build an armada across more than 30 single-player missions. Choose unit types, fleet formations and flight tactics for each strategic situation.

It is four thousand years before the Galactic Empire and hundreds of Jedi Knights have fallen in battle against the ruthless Sith. You are the last hope of the Jedi Order. Can you master the awesome power of the Force on your quest to save the Republic? Or will you fall to the lure of the dark side?

The Man With The Hat Is Back In His Greatest Adventure Yet! 1939 - The eve of World War II. Nazi agents are about to get their hands on a weapon more dangerous than the atom bomb. Only Indy can stop them before they unleash the deadly secret that sank Atlantis.

Prepare to enter a world "torn asunder" by timeless, unresolved conflicts--a world of incomparable beauty, intrigue, and betrayal. Prepare to go to Riven. Journey through vast, awe-inspiring landscapes, where clouds sit nestled in a deep blue sky and the rolling sea waters shimmer from bright morning sunlight.