Portal without portals: fans restore Valve's cancelled project nearly 20 years later
Enthusiasts have assembled a playable version of F-Stop from leaked materials. Instead of a portal gun, this puzzle game uses a camera to manipulate objects.
The Valve Cut Content community has restored a playable version of F-Stop, an experimental puzzle game that Valve developed in 2007 as a potential continuation of Portal's ideas. To assemble it, enthusiasts combined game assets, source code, and level data from several leaks.
The player's main tool here is a camera. With it, objects can be photographed, then their copies placed in space, resized, and used to solve puzzles. The familiar portal gun is absent from this mechanic.
Some of the F-Stop materials were discovered in an August leak of Steam's archival data, totaling around 12 TB. Later, the community obtained the source code and map data, enabling the assembly of a working prototype.
The restored version remains unfinished: it lacks some textures, assets, and character dialogue. Nevertheless, published videos demonstrate level progression and the functionality of core mechanics.
It is important to note that this is the restoration of a cancelled project, not a new game from Valve or an official re-release. Even the existence of a playable build does not mean the project reached the state in which the company would have released it for consumers.
Valve abandoned F-Stop and subsequently released Portal 2. The current work by enthusiasts offers a glimpse of one of the alternative ideas the studio considered nearly two decades ago.
