A fully playable version of Portal prequel F-Stop leaked

Nearly two decades after it was abandoned, the camera-based prequel to Portal known as F-Stop can now be played. Nearly two decades after being canceled, the camera-based Portal prequel F-Stop is no longer lost media. The leaked version of this canceled Portal prequel is now playable. Most of the game's assets were obtained from a massive 12-terabyte leak that occurred in August.

However, crucial elements such as the game's source code and map data were not part of the leak. These last pieces were reportedly found in the Valve Cut Content Discord this week, enabling a nearly complete version of the game to be reassembled. Certain dialogues and aspects from F-Stop ended up in Portal 2. Despite this, F-Stop is very different from the main Portal games.

Unlike Portal 2, F-Stop is centered around a camera mechanic. This mechanic allows players to capture an object by taking a picture of it and then place it elsewhere using the resulting Polaroid-like photos. The game is brief, with videos showing the entire campaign lasting less than an hour. This is not unexpected, though. F-Stop was created as part of Valve's "Directed Design Experiments," a three-month period in 2007 when the company assembled five teams to create new video game experiments.