After you place two cubes on two red buttons, you reach Test Chamber 06.
![You reach Test Chamber 06 after you place two cubes on two red buttons. You reach Test Chamber 06 after you place two cubes on two red buttons.](/portal-walkthrough/_IMG/test-chamber-06.jpg?w=731&r=16x9)
High Energy Pellet
There is a High Energy Pellet bouncing up and down between a portal and a machine. There is also a pellet containment machine on the floor. Notice that the containment machine is shining an orange light on the ceiling. Place a blue portal there, and the pellet will go through the orange portal and into the containment machine. This will lower a translucent platform. Step onto it to be raised up to the elevator to Test Chamber 07.