Optimized

The Stanley Parable

The Stanley Parable is a first person exploration game. You will play as Stanley, and you will not play as Stanley. You will follow a story, you will not follow a story. You will have a choice, you will have no choice. The game will end, the game will never end. Contradiction follows contradiction, the rules of how games should work are broken, then broken again. This world was not made for you to understand.

Trainz Simulator 12

Trainz Simulator 12 is a 3D railroad simulator that uses DirectX or OpenGL with multiplayer and the option of downloading 3rd party tracks, railcars, and objects.

Jazzpunk

Jazzpunk is a comedy adventure set in an alternate reality Cold War World, plagued with corporate espionage, CyberCrime, and sentient martinis. Gameplay is inspired by spoof comedy films and cartoons of yesteryear, with a focus on weird gadgets, exotic locales, and open-world style exploration.
(source: steam store page)

Spelunky Classic

Explore mysterious caverns to collect treasures while avoiding traps and monsters.

Spelunky is a freeware game first released in 2009; it was renamed to Spelunky Classic following the release of an enhanced commercial version in 2013.

Hard To Be A God

Hard to Be a God is a role playing game with adventure and espionage elements based on a storyline of the novel with the same name by Strugatsky brothers.

Life Goes On

Sacrificial teamwork: the essence of coo(rpse)peration.

Assetto Corsa

Assetto Corsa is a racing game/simulation with a strong focus on realism.

PixelJunk Monsters Ultimate

A recent port of an old and popular PS3 game. First PC port from the developer Double Eleven.

Wreckfest

A racing game inspired by Destruction Derby (1995) and the classic FlatOut series, Wreckfest features detailed physics and damage for both on-track objects and vehicle models.

PixelJunk Shooter

One of the few (and arguably the best) fluid-physics based puzzlers on the omnipotent PC platform is in fact... a cave shooter released 4 years earlier on the PS3. Go figure.