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

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

Published: Nov 1, 2026, 6:01 PM UTC

Valve's long-lost prototype Portal prequel appears online after nearly 20 years — Valve's long-lost prototype Portal prequel appears online after nearly 20 years — Image credit: Valve

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

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Valve's long-lost prototype Portal prequel appears online after nearly 20 years | Game2Wins News