Technology

Valve's long-lost prototype Portal prequel appears online after nearly 20 years

PC Gamer • Sun, 01 Nov 2026

F-Stop was a result of a post-Orange Box, 2007 Valve game jam.

What happened?

F-Stop was a result of a post-Orange Box, 2007 Valve game jam.

Story details

F-Stop was a result of a post-Orange Box, 2007 Valve game jam.

Why it matters

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Original source

https://www.pcgamer.com/games/fps/valves-long-lost-prototype-portal-prequel-appears-online-after-nearly-20-years/

Leakers have pieced together a playable version of the canceled Portal prequel F-Stop. Most of the assets came from the massive 12-terabyte leak that dropped this August. That didn't include the game's source code or map data, but those final pieces apparently hit the Valve Cut Content Discord this week, allowing a nearly complete version […]

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All the leaks for the Portal prequel F-Stop have been compiled into a playable game

This rough version is the closest thing to a release we'll see.