Beyond the main test chambers, GLaDOS has several 'secret' rooms or areas that can be accessed with creative portal usage. These often contain graffiti, messages from previous test subjects, or glimpses into the facility's darker history. They are not always obvious and require you to think outside the box, often using portals to reach areas that seem inaccessible. For example, in some chambers, you might notice a small gap in a wall or a vent that looks like it could lead somewhere. Experiment with firing portals into these tight spaces or using momentum to launch yourself into unexpected openings. These rooms provide environmental storytelling and deepen the lore of Aperture Science, offering a chilling perspective on the facility's operations.
