# Cancelled Portal prequel F-Stop rebuilt into nearly complete playable game

- URL: https://talkfuse.com/story/a-fully-playable-version-of-portal-prequel-f-stop-leaked/
- Published: 2026-11-01T18:08:43+00:00
- Original publisher: The Verge
- Original article: https://www.theverge.com/games/1024206/playable-portal-prequel-f-stop-leak
- Topics: Software

## Key points

- Missing files helped make cancelled prequel F-Stop playable.
- Its camera mechanic lets players move objects through photographs.
- Videos of the full campaign run for under an hour.

## Summary

Newly surfaced source code and map data have enabled leakers to assemble a nearly complete playable version of F-Stop, a cancelled Portal prequel. The recovery offers a fuller look at a game whose experimental camera-based puzzles differed sharply from the Portal series.

Most of its assets came from a 12-terabyte leak in August, but that release lacked the source code and map data, which reportedly appeared in a Valve cut-content Discord this week. F-Stop lets players photograph objects and use the resulting images to place them elsewhere; some dialogue and ideas later appeared in Portal 2. Videos showing the full campaign run for under an hour, and the game was developed during Valve’s three-month experimental period in 2007.

## Coverage

- [The Verge: Cancelled Portal prequel F-Stop rebuilt into nearly complete playable game](https://www.theverge.com/games/1024206/playable-portal-prequel-f-stop-leak)
- [Engadget: All the leaks for the Portal prequel F-Stop have been compiled into a playable game](https://www.engadget.com/2303446/all-the-leaks-for-the-portal-prequel-f-stop-have-been-compiled-into-a-playable-game/)
- [PC Gamer: Valve's long-lost prototype Portal prequel appears online after nearly 20 years](https://www.pcgamer.com/games/fps/valves-long-lost-prototype-portal-prequel-appears-online-after-nearly-20-years/)

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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.