She also says that you are an excellent test subject. One flaw in Test Chamber 16 lets you push a Weighted Storage Cube through the Material Emancipation Grill and take it up in the elevator to Test Chamber 17. Test Chamber 14 - You are an Excellent Test Subject The computer mentions that portals leak high energy gamma radiation. You merely need to take advantage of two deficiencies in Aperture Science’s Test Chambers. There is indeed a way to save your loyal Companion Cube.

How do you keep the Companion Cube in Portal 1? You will fly and land in the room with the cube. When you step out into the room after deactivating all the turrets, immediately turn around and shoot a portal on the slanted platform, then jump down the ledge and shoot the other portal under you. How do you get the cube in test chamber 18?

Turn right and place a portal on the ceiling.

You should automatically drop through for the second time and then land on the other side of the Goo.

Go back in the hall and the shoot a portal on the floor at the end of the hallway.Run to the other side while using the cube as a shield.Upon reaching the other side of the hallway, look out for the bouncing Pellet.Pick up your Companion Cube and place it in front of the small ledge.

Portal test chamber 14