: Although it chronicles a VR game, the Final Hours app itself is played on a standard monitor. Availability & Access

: View early video prototypes of Alyx, concept art, and high-resolution images of the "Plantation" leak from Left 4 Dead .

: Explore a photogrammetry-based 3D recreation of Valve’s development floor.

: Fans finally got confirmation of other "lost" games, including a Dota 2 -themed RPG and an open-world Left 4 Dead game set in Morocco. Interactive Features

The story behind The Final Hours of Half-Life: Alyx isn't a traditional game download, but rather an written by Geoff Keighley that reveals the secretive decade leading up to Valve's return to the Half-Life series.