Valve's canceled Portal prequel F-Stop reportedly playable in leak-assembled build

A community-assembled build of F-Stop, Valve’s canceled Portal prequel, is reportedly playable after separate leaks of assets, source code and map files. The game centers on a camera that captures objects in photos and places them elsewhere. Some of its dialogue, characters and mechanics were later reworked into Portal 2. Players report missing assets and dialogue, leaving the build’s completeness unclear.