Corroborated

A playable build of Valve's canceled Portal prequel F-Stop is circulating

Fans rebuilt it from a massive Steam data dump. Valve has not commented.

Leaked on 31 October 2026

Screenshot of @gabefollower's X post: There was another Valve leak. Someone shared maps from F-Stop, the canceled Portal sequel. Compiled with all the previous leaks, F-Stop is f — @gabefollower's post on X, with counts as of 09 Nov 2026 12:49 UTC. Live post on X

Nearly 20 years after it was canceled, Valve's camera-based Portal prequel F-Stop is no longer lost media, The Verge reported on November 1. Fans have pieced together a playable version, with most assets taken from a 12-terabyte data dump.

Gabe Follower (@gabefollower), which tracks Valve, shared footage of the build on X. The Verge reports that the build shows the camera mechanic the project was known for.

‎Gabe Follower @gabefollower

There was another Valve leak. Someone shared maps from F-Stop, the canceled Portal sequel. Compiled with all the previous leaks, F-Stop is fully playable with all code, assets, and now maps available to the public. https://t.co/4Uqeb7GApZ

10,267 likes · 717 reposts · counts as of 09 Nov 2026, 12:49 UTC

— ‎Gabe Follower (@gabefollower) October 31, 2026

not in our leaker index

The Verge also reported on the build. Valve has not commented, and the files come from leaked material.

Sources

Status key: how we label leaks · Corrections · Contact