In multi-player mode, select either Xbox Live or System Link. Go to Co-op Challenges, and select "CodeName: Onyx". Choose Mission 03. If you chose Xbox Live, make sure this is a private game so that you can host your own room. Press X to start the game. Go through the double doorway to the right of the gadget stock, then turn right at the stairs and walk up. On the wall will be a Comcast sign. Turn and go up the stairs once more and enter the room with the number 2 on the wall to the left of it. Once in the room, turn right to the first open window. Run all the way to the end of the walkway and jump to the landing directly in front of you. Climb up the ladder, stop, turn right until the camera is facing the building you just came from. Look up to see a huge Comcast billboard. Click the Right Analog-stick to view it from your goggles. D-pad Up zooms in, while D-pad Down zooms out.