Test Chamber 16 is Portal 2‘s final main puzzle room and it’s definitely one of the game’s trickiest. It combines excursion funnels, repulsion gel, and turrets in a way that can stump even the most ...

Final Transmission can be found in Chapter 2, Test Chamber 6. You need to carry a radio -- which shows up in a clump of garbage after you hit a button -- into a window above the chamber. After you get ...