Because glados required technology to project the portal, and that technology was only available in the test areas, not the maintanance areas. We never saw the areas outside of the enrichment center, so we dont know if there was even an enterance/exit aside from portals. And chell escaped by exploiting the lack of inhibiting devices and a design flaw in the "oven" area, maby even concidering chells ascention to gladoses chamber the true final test...
glados was made to run tests, even in her rampancy, she still ran tests, even the test of which is superior, human intelect or artificial inteligence...
Also the "portals are the only way in/out" theory makes it possible for her to flood the center with poison gas, otherwise people would try escaping out windows/doors, and keep out prying eyes.
glados was made to run tests, even in her rampancy, she still ran tests, even the test of which is superior, human intelect or artificial inteligence...
Also the "portals are the only way in/out" theory makes it possible for her to flood the center with poison gas, otherwise people would try escaping out windows/doors, and keep out prying eyes.