Nearly two decades after Valve canceled it, the camera-based Portal prequel F-Stop is no longer lost media. Leakers have pieced together a fully playable version of the prototype, according to The Verge and Engadget.
The build comes from a massive 12-terabyte Steam data leak that surfaced in August, which included F-Stop assets alongside early material from Left 4 Dead, Portal 2, and Half-Life. The game's source code and map data were missing at the time, but those final pieces reportedly appeared on the Valve Cut Content Discord server this week, allowing the community to assemble a nearly complete version.
F-Stop gameplay and camera mechanic
F-Stop differs dramatically from the mainline Portal games. Instead of portals, it is built around a camera mechanic that lets you capture an item by taking its picture and then place it elsewhere using the resulting Polaroid-like photos. Engadget notes the system is similar in spirit to Viewfinder, letting players store and relocate physical objects.
The game is short: videos showing off its full campaign all clock in at under an hour. That is not terribly surprising given its origin as a rapid experiment rather than a full production.
- Built around a camera mechanic: photograph an object to capture it, then place it elsewhere using Polaroid-like photos
- Developed in 2007 as part of Valve's 'Directed Design Experiments,' a three-month period when five teams built new game experiments
- Playtime is short — full campaign videos clock in at under an hour
