Preservation

F-Stop, a cancelled 2007 Valve project conceived as a prequel to Portal, has leaked online in a fully playable form after three separate leaks were combined. The game came out of Valve's "Directed Design Experiments," a period in 2007 when the studio split into five teams to prototype original concepts, as later described by Gabe Newell. F-Stop's gameplay centred on an experimental Aperture Science camera used to manipulate perspective to solve puzzles. The project was never released and had previously only been known through documentation on sites such as the Half-Life wiki. via kotaku.com

Games That Weren't has published research into Psychasm, an unreleased action game that was in development at Inscape around 1995. Inscape was the studio behind CD-ROM titles such as The Dark Eye, Drowned God and Bad Day on the Midway, but almost nothing had previously been documented about Psychasm before it disappeared without release. The project came to light thanks to researcher JomSpoons, who uncovered rare references to the game and tracked down composer Glenn Scott Lacey, who had worked on its music and audio. via gamesthatwerent.com