In Test Chamber 01, you'll receive your first Portal Gun, capable of firing only blue portals. GLaDOS will instruct you on its use. Look for the white wall panels. Fire a blue portal (Left Mouse Button) onto one of the panels. Then, fire another blue portal onto a different white panel. You'll notice that the first portal disappears as the second one is created. This chamber teaches you that you can only have one blue portal active at a time. Your objective is to use this single blue portal to reach the exit. Look for a white panel on a higher ledge. Fire a blue portal there, then walk into a blue portal on the ground to be transported to the higher ledge. Proceed to the exit elevator.
