F-Stop, Valve's long-canceled Portal prequel, is now something you can actually play. Leakers have assembled a rough but functional build of the project, drawing most of its assets from the massive 12-terabyte Valve leak that surfaced this August, The Verge reported.

F-Stop has been one of gaming's great what-ifs for over a decade — a Portal follow-up built around a photography mechanic rather than portals, quietly shelved before Valve pivoted to Portal 2. Until now, it existed only in developer anecdotes and scattered concept material.

The compiled version is unpolished, and Engadget notes it is likely the closest thing to a release the project will ever get. Valve abandoned the game years ago and has shown no interest in reviving it, so this fan-assembled artifact effectively serves as the historical record.

The August leak didn't contain everything needed on its own; the community pieced together the remaining gaps to get the build running. It's the latest example of preservation-minded fans reconstructing canceled games from leaked source material — legally murky, but catnip for anyone curious about the road Valve didn't take between Portal and its sequel.