HAL REACH
"YOU'RE DOING VERY WELL! CAKE AND GRIEF COUNCILING WILL BE AVAILABLE AT THE COMPLETION OF THE STORY."
I wouldn't trust her. I heard the cake was a lie!
"Please make use of the grenades to your right. There is also a pistol for you to use. If you run out of ammo or grenades, return to the Aperture Science dispersal arm." I picked up a grenade belt with five grenades on it. As I grabbed it an elite rushed me so I dropped a portal below and put one above it, creating an infinite loop.
I then pulled my pistol out and took aim. It was a tough shot but, with a lot of skill, and a little luck, I headshot the elite and a grunt half way across the room. A group of 3 grunts gathered at the bottom, so I shot a portal at the wall behind them and threw a grenade at the portal in front of me. And sure enough, it landed right by their feet.
After the explosion I saw a box come up from the ground. "please place the Weighted Storage Cube on the 16 megawatt button and head for the exit." After I placed the box on the button, I went through the door and that's where I saw her.