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Portal Walkthrough Chapter 9

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Time to get your best friend, the companion cube! Use him to get up the stairs (with ctrl+jump) and to shield you from the pellets.

First, use the cube to bounce this pellet into the receiver.

Secondly, use portals to get one of the pellets you dodged just before into this receiver.

Lastly, get the last pellet to come out of the pushed out panel. Put the cube on the button by the far door, and stand crouched on the very edge of the front button.

Now it's time to burn your cube, you monster. Place it on the button, press the button ahead, grab the cube and then drop it in the incinerator.