If you're something of a Portal or Half-Life head, you'll probably already be familiar with F-Stop, an unreleased Portal prequel that remained quite mysterious for many years. Back in 2020, a much deeper look was revealed in a semi-official capacity, revealing a pretty neat concept (that isn't so dissimilar to that of Superliminal). Now, all these years later, assets and source code for the game has leaked, and what exists of F-Stop is fully playable.

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