The second receiver has a glass barrier as well, making it more difficult to bounce the pellet in. It is easy enough, however, to place one on the ceiling above the angled platform, and the pellet will bounce off and into the receiver. The first receiver has a glass barrier preventing the normal method of placing a portal on the angled platform. Do your best to climb the stairs as before, and then rebound the pellets as you move through the halls. You may quickly find that the ball seems to have a mind of its own, in that even if you set it down in a stationary setting, it may roll around aimlessly anyway. In the advanced chamber, the weighted companion cube has become a ball, the platform activations are tougher, and an extra step has been added towards the end. Proceed into the open room and press the button to open the incinerator, then quickly grab the cube and drop it in. GlaDOS will explain that you must euthanize the cube by placing it in the incinerator. Jump across all three platforms and onto the next level, and then place the cube on the next button. Once all three platforms are raised, shoot a portal onto the ceiling or high wall, and bring the cube with you.
