Operation: Black Mesa

Black Mesa: Definitive Edition includes performance improvements with a higher frame rate in some levels and visual upgrades, as well as all new and expanded Xen levels.

Half-Life: Alyx is Valve’s VR return to the Half-Life series. It’s the story of an impossible fight against a vicious alien race known as the Combine, set between the events of Half-Life and Half-Life 2. Alyx Vance and her father Eli mount an early resistance to the Combine's brutal occupation of Earth.

Black Mesa is a re-envisioning of Valve Software's classic science fiction first person shooter, Half-Life. Powered by Source Engine, You will re-visit the inaugural role of Gordon Freeman and his memorable journey through the Black Mesa Research Facility. Expect detailed environments to explore, a huge cast of characters and experimental weaponry. All-new music, voice acting, choreography and added dialogue give way to a more expansive and immersive experience than ever before.

Defy Gravity is an action platformer that is a mix between classic platforming and gravity based puzzle solving. Kara, our heroine, has access to a unique gameplay mechanic that she uses to manipulate the world around her. She has a gun that is able to alter the laws of physics through the creation of pockets of gravity and anti-gravity. By mastering the use of these abilities Kara is able to augment her jump in order to almost fly past obstacles. These powers can also be utilized to move objects that block her path and platforms that Kara stands on in order to traverse the levels.

You play as Danny, a young man suffering from insomnia, who uses an experimental device to explore his mind and discover the cause of his sleeplessness. Each level of the game, representing events from Danny's life and inspired by artists such as Tim Burton and M.C. Escher, requires the player to control Danny as he collects his "lost marbles" and other thoughts.

Super Mustache is a vintage styled platformer, filled to the brim with 8 bit pixel art juice! Join Captain Super Mustache in a journey to save the planet Uranus. If you enjoyed classic platformer games from the golden era of video games, then you’re going to love this.

Holodrive is a super fast-paced collectable 2D multiplayer shooter. Create your robot, customize it and jetpack your way to victory!

Prepare for one of the most action packed-shooters in PC gaming history! Every level is full of enemies and targets for you to destroy! You will become a soldier of the alien species and protect your home world from the forces of the Human armada.

Journey through a surreal, vivid and highly stylized world filled with mystery, wild high-speed traversal, endearing characters, and massive enemy encounters. The Void beckons…

Use conventional and three types of special weapons to overcome difficult situations. Take control of the battlefield with support aircraft! Long-established STG development team, Blue&White, the first new one in 13 years, and a new origin!

Raze is a third-person platformer shooter, developed on March 3, 2008 and released March 5, 2010, Raze involves on the battle between the Aliens and the Humans in a struggle for survival . As the Humans, you play as the Raze Soldier. On the other hand, you play as a Desert Alien. These games feature futuristic and versatile weapons such as the Assault Rifle and Sniper Rifle. Would you play as the Humans and fight for ultimate survival? Or would you instead be with the aliens and fight for the extinction of Humans?

Momentum Mod is a free mod built on the Source Engine that aims to faithfully recreate, centralize, and improve upon the movement game modes found in Counter-Strike, Team Fortress, Half-Life 2, and Titanfall.