Rule 1: You can use the Portal Gun, but not too much. Excessive use will result in a visit from the Aperture Science Enforcement Agency.
Rule 2: Don't use the Portal Gun near water or open flames. We've got a lot of paperwork to fill out if someone tries to turn themselves into a human-crustacean hybrid.
Rule 3: If you're using the Portal Gun to escape from a hostage situation, you're doing it wrong. Call the authorities, people!
Rule 4: No Portal Gun use during office hours or in front of a mirror. We have a strict no-reflection policy.
For more information, visit our FAQ or check out our Rules of Engagement.