Part 19

Guide to completing Part 19 of Portal, including instructions on how to navigate the test chambers, solve puzzles with the Weighted Companion Cube, and progress through the facility.

Grab the Weighted Companion Cube and bring it near the hallway door. After the energy ball hits the wall, grab the box and carry it in front of you down the hallway.

[Computer] "The symptoms most commonly produced by Enrichment Center Testing are superstition, perceiving inanimate objects as alive, and hallucinations. The Enrichment Center reminds you that the Weighted Companion Cube will never threaten to stab you and, in face, cannot speak."

Once at the other end, be sure to get off of the stairs or else you may be hit by an energy ball on the top of you head. Turn and face the other hallway. When the ball is shot, run with the box in front of you down the hallway. Be sure to get off of the stairs on the other end to avoid the wrath of the energy ball.

Camera Shy

Turn and face the stairs you just came off of. It is to the left of the stairs on the wall.

Run into the next room.

Camera Shy

Once in the larger room, turn towards the center and look down. It is on a doorway near the left of the slanted wall without the receptacle.

Jump down with the cube. Go into the room to the left of the slanted wall with no receptacle on it. Once in here, use the cube to bounce the energy ball into the receptacle. Return to the main room. Grab the box and go into the only other door here.

Don't place the box on the first button. Instead, go to the far left of the room near the back and place it on the button that is on top of a large platform. Now place one portal on the pushed out wall near the ground and another on the wall above the "pit" you are in, on the higher walkway then go through.

Go back into the small room through the doorway here and place the portal you came out of (the one that was not on the pushed out slab) on the wall where the energy ball is hitting. Now jump down from the ledge, being careful of the energy ball and go into the room with the cube in it.

Crouch down near the side of the button so you are barely on the button, but it opens the door behind you. The ball will go into the receptacle. Crouching is not absolutely required, but it does make you a smaller target for the energy ball to hit if you are too close to the center of the button.

[Computer] "The Enrichment Center reminds you that the Weighted Companion Cube cannot speak. In the event that the Weighted Companion Cube does speak, the Enrichment Center urges you to disregard its advice."

Grab the cube and return to the larger room outside. Walk over to the pushed out slab and go over to the right side of it, then look in. You will see writing on the wall. Shoot a portal where you can, then go through the one that should still be on the stone slab.

Commentary Node

Look to the center of the room. It's floating above the ground there.

[Ellen McClane, Voice of GLaDOS] "I know that I was told that, you know, sort of the idea of Valve is that everything... Everything is planned. Everything is worked out in advance. But that's a big fat lie. Because: The initial idea is started, and then they bring an actor into the studio and they say, you know, "Say these words for us, say this computer generated voice for us." Okay, I'll do that. Well, then, that gives the creators other ideas. And it's... It's a rolling process. You roll from one idea into the next idea."

Go back up to the raised walk portion. Before you leave here, shoot a portal at the slanted piece with no receptacle. Return all the way to the room with the two energy ball dispensers and stand near the base of the right set of stairs.

When the ball goes down the hallway, pop up the stairs and shoot a portal at the wall at the end of the hall. Return to the large room. Be sure you have the cube with you, then jump across the platforms. Jump down to the brown hallway below.

Take the cube around the corner and up the stairs, then place it on the button.

[Computer] "You did it! The Weighted Companion Cube certainly brought you good luck. However, it cannot accompany you for the rest of the test, and unfortunately, must be euthanized. Please escort your Companion Cube to the Aperture Science Emergency Intelligence Incinerator."

If you wait around, the computer will say the following things:

[Computer] "Rest assured that an independent panel of ethicists has absolved the Enrichment Center, Aperture Science employees, and all test subjects of any moral responsibility for the companion cube euthanizing process."

[Computer] "While it has been a faithful companion, your Companion Cube cannot accompany you through the rest of the test. If it could"