Hide behind the cube until the turrets calm down, then pick up the cube and walk off the edge. 
Take cover behind the moving panel as it slides out, then as soon as it locks in place dash out to place your blue portal on it, then run back again to the big button and jump off the platform and through the red portal to propel yourself across the turret room to the cube.
Shoot the red portal onto the floor way down below. If you can get all this coordinated you will come flying up from the 4-dot platform and you can shift yourself to land right by the big button. Quickly shoot the second portal under your feet before you touch down. At the same time, you have to be directing your fall so you land on the 3-dot platform. As you fall, shoot a portal across to the 4-dot floor, aiming for the left side of it. There are some blocks sticking out of the side wall that can queer your shot here, so watch out for those. Get into a position where you are facing towards the 4-dot platform with minimal obstructions. Shoot the second portal onto the walkway where you can move around it and look through. To the right of it, you should be able to see a bit of the adjacent higher ceiling. Go out to the end of the walkway and over against the wall on your left. These facts cause me to believe that the appearance of medal challenges for 13-18 advanced chambers was merely a oversight in the Portal: Still Alive version of the game. 13: Advanced also has bronze at 9 portals, silver at 5, and (presumably) gold at 4 even though the chamber is modified.Īlso, from what I can gather online, the Orange Box version of the same game didn't have medal challenges for the advanced chambers at all (and still had the same medal challenges for the standard chambers). For example, the Testchamber 13 least portals challenge gives bronze at 9 portals, silver at 5, and gold at 4. The targets for these challenges appear to be exactly the same targets as their standard counterparts. In the challenge maps, there are advanced levels for chambers 13-18 named like "14: Advanced" and just like the standard chambers, they have medal challenges in least portals, fastest time, and least footsteps. I am playing Portal: Still Alive on XBox 360.
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