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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...
