A full Portal prequel, detailing the story of GLaDOS and the inner workings of Aperture Science in the lead up to the events of the Valve puzzle game, has launched on Steam with full ray tracing and Nvidia DLSS 3 support. Originally created in 2008, just after the release of the original Portal, Portal Prelude is a full-length, fan-made campaign, containing 19 new test chambers, whole-new voice-acted characters, and a bespoke origin story for GLaDOS. And now, as a showcase for Nvidia's RTX Remix, it's back and looking better than ever, with totally overhauled visuals and some of the best-looking, well, portals we've ever seen.
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