# Valve’s canceled Portal follow-up F-Stop is now fully playable thanks to that 12TB Steam leak and some dedicated fans

- URL: https://talkfuse.com/story/valves-canceled-portal-follow-up-f-stop-is-now-fully-playable-thanks-to-that-12tb-steam-leak-and-some-dedicated-fans/
- Published: 2026-11-02T16:43:31+00:00
- Updated: 2026-11-06T15:09:00+00:00
- Original publisher: GamesRadar+
- Original article: https://www.gamesradar.com/games/puzzle/valves-canceled-portal-follow-up-f-stop-is-now-fully-playable-thanks-to-that-12tb-steam-leak-and-some-dedicated-fans/
- Topics: Gaming

## Key points

- Fans recovered a playable version of Valve’s cancelled F-Stop.
- Its puzzles use photographs to change the environment.
- Playtesters questioned the absence of the Portal Gun.

## Summary

Valve’s cancelled project F-Stop, once planned as a prequel to Portal, has become playable after fans recovered its source code and map data from a large Steam data leak. The discovery gives players a chance to experience a lost Valve game, offering a glimpse of an abandoned direction for the Portal series.

The leak, 12 terabytes of Steam data from 2003 and 2013, included builds of games such as Portal 2, Left 4 Dead and Counter-Strike: Global Offensive. F-Stop’s puzzles centre on taking photographs to manipulate the environment, and its introduction features an earlier version of Cave Johnson’s narration. Valve reportedly cancelled it after playtesters questioned why a Portal follow-up did not include the Portal Gun.

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Summarised by TalkFuse (https://talkfuse.com/). Quote the original publisher for the reporting and link this page for the summary and discussion.