A fully playable version of Portal prequel F-Stop leaked
It's oddly fitting that the most interesting Valve game of the past decade is one they never released. F-Stop was shelved around 2011 because the core mechanic, manipulating light and perspective to solve puzzles, apparently never scaled into a full game. Now that leakers have stitched together a playable build from the August cache and this week's Discord drop, we can finally see what Valve walked away from.
I'm skeptical about how faithful this is to the real thing. The source code and map data arrived piecemeal, and a community-assembled build is a reconstruction, which carries its own risks. Still, the fact that it's playable at all tells us the prototype got further than Valve's reputation for killing projects suggests. The company has always been comfortable abandoning work, but rarely do we get to open the drawer and see what was inside.
The bigger story is how leaks have become the preservation layer for games that publishers decide never existed. Portal 2 shipped, F-Stop didn't, and without the people hoarding these files, that distinction would be the only record. I'd want to know whether the build shows the actual reason it was cut, or whether the reasons were more mundane, like schedule and scope. Either way, it's a rare chance to judge a decision Valve made over a decade ago.