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Portal: Prelude, as its name states it, is an unofficial prequel to the game Portal. 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 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 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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Just played through this mod and it's awesome. The creators of this mod really put a lot of work into this and the entire things feels really professional. The test chambers are tricky and detailed (some are just downright frustrating/seemingly imposible) and the story gives some insight in the events leading up to Portal (from a fan's perspective).
Absolutely a must have for any Portal fan. You can get the mod from
www.portalprelude.com. Just install it and it will show up in your Steam Library as an installed mod. The game comes with bonus maps and commentary.