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Portal: Prelude: 15ᵗʰ Anniversary Edition, as its name states it, is an HD remaster and celebratory re-release of an unofficial prequel to the game Portal, adding a Portal 2-esque look to the scenario. Its story revolves around the pre-GlaDOS epoch, even before she was plugged in. At this time, test subjects were monitored by real Aperture Science employees whose work was tedious, lengthy and repetitive. This along with Cave Johnson's fatal illness is why they decided to build a great artificial intelligence that could both replace them in these difficult tasks, but also take responsibility for many other tasks within the complex, keep Cave alive and compete with Black Mesa's superiority. All employees of the Aperture Science complex are now eagerly awaiting GlaDOS. Maybe even a little too eagerly, as the upcoming events will tell...
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Alpha demo for the 15 anniversary release. The overhaul is still in development, so anything seen here is subject to change.
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Ahhh back to the old roots eh.
If I can make a suggestion, a steam release for this mod would be great. It would also allow people who haven't played the old mod give it a try because they don't know about moddb or how to install mods outside of steam in general.
If it gets enough good feedback, I might see about doing it for the 20th Anniversary, along with some content that I don't have enough time for. This version will mostly just contain the Main Story, the Challenge Maps, and the Advanced maps will be replaced with an Advanced campaign taking place after GLaDOS is activated, and sometime before Portal: The Flash Version.
Yes, this is supposed to be an extended fanon-verse.
instructions to install?
extract the rar file into your sourcemods folder and restart steam. then you can find the game in your steam library