|Portal Prelude is an unofficial
prequel for Valves smash hit title 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, and also take responsibility for many other
tasks within the complex and compete with Black Mesa's superiority...