Portal 2/The Cold Boot

''“Sorry about the mess. I’ve really let the place go since you killed me. By the way, thanks for that.”''

Head up the stairs into the “first simple test, which involves deadly lasers”. Wait a few moments for the puzzle to reassemble itself, then head to the other side of the room right below the door. Shoot one portal at the end of the laser and connect it to the laser receiver. You’re standing on a platform and it’ll ascend to the door, letting you continue.

“This next test involves discouragement redirection cubes.”

Walk into this chamber and hop over the laser (as instructed onscreen). In the corner of the room lies a cube, but it’s different than the others — it can redirect lasers. Shoot a blue portal under the cube and an orange one on your side of the wall so that you can grab the cube. Once you have it, send it into the laser receiver perpendicular to the beam. This will activate a staircase; walk up it. Now shoot a blue portal at the ground on this upper level and an orange one under the cube, and you’ll be able to grab the cube and set it on the button next to you. Time to forge ahead!

''“Don’t let that ‘horrible person’ thing discourage you. It’s just a data point. If it makes you feel any better, science has now validated your birthmother’s decision to abandon you on a doorstep.”''

Climb the staircase and head through the door. Wait a moment for the puzzle to put itself back together.

First order of business: portal your way to the top ledge. From there, shoot one portal above the central platform and another on the nearest wall. Grab the cube and drop down onto the center platform. Redirect the beam to the laser receiver. Second order of business: portal the second laser (by the ceiling) from the wall to the receiver right above the top ledge platform where you found the cube. With the two receivers happy, head on through the door and down the elevator.

Walk on through the stairs and debris. After a moment, GLaDOS will unblock the passageway and allow you to continue on into the main puzzle room.

First, put the laser in the receiver. Put a blue portal at the end of the laser and the other to the left of the entrance. Next, portal your way to the button across from the entrance. Press it and grab the cube that falls out. Pick it up and wait for the platform to come in front of you. When it does, hop over the laser (or block it with the cube). Drop the cube on the button and walk through the door into the next chamber.

''“This next test involves the Aperture Science Aerial Faith Plate. It was part of an initiative to investigate how well test subjects could solve problems when they were catapulted into space. The results were highly informative. They could not. Good luck.”''

Climb the stairs and go forward, pausing to let GLaDOS clear the way.

Step on the first Aerial Faith Plate to catapult yourself across the way. Press the button to start a cube bouncing in the middle of the room. You’ll need to catapult yourself into the air at the right time so that you can grab the cube out of the air. Once you do that, place it on the large red button by the door and continue on.

''“Let’s see what the next test is. Oh. Advanced Aerial Faith Plates. Well, have fun soaring through the air without a care in the world.”''

Pass on through into the advanced Aerial Faith Plates puzzle. Step on the first one, and you’ll fly through the air onto a series of catapults. After the third one, you’ll be flying towards two panels. Shoot one portal on the left panel and one on the right, and you’ll continue your flight and land on a platform.

Before you hit the button, leave one portal on the right panel and pop the other one above the button. When you press the button, trash will come out and fall on the big button, go there and find the radio that fell with the trash, once you get it return to the beginning of this chamber. There should be a portal surface above the left panel, pop a portal there while leaving the other one on the right panel. Hop on the faith plate while holding the radio and eventually you'll find yourself in the secret area, leave the radio there and voila, you get an achievement!

Now, there's another achievement in this chamber. When you return to the small button, do not press it until you place a portal above the big button again and leave the second one on the right panel now press the small button and wait for the cube to fall on the big button. You get another achievement!

In this next area, hop over the laser and try to grab the companion cube. GLaDOS will fizzle out two of them before you can actually begin the puzzle. Once she’s done destroying them, place it so that it blocks the laser. Stand on the platform that drops down, then use portals to move the companion cube somewhere else. The platform will ascend into the next area. You’ll need to get the companion cube, so portal it up to you.

There are two panels here. Use the one on the right side. Place a blue portal on it and an orange one on the ground below. With the companion cube in hand, jump down into the orange portal and fly to the red button. Place the companion cube on the button. This makes a platform appear. Use the same momentum technique on the other panel and soar through the door.

You can use portals to bring the companion cube to the elevator for an achievement, if you like. Continue on.

“This next test involves emancipation grills.”

This is two rooms separated by an emancipation grill; walking through it will vaporize cubes and destroy your portals. To solve it, shoot a portal through the small hole so that you can pass through to the other side with portals. Press the button and a redirection cube will appear. Portal it to the other side. Use it to redirect the laser into the receiver on the other side of the emancipation grill. This will open up the door and you can keep going. Onward to Chapter 3!