Part 29

Guide to completing Part 29 of Portal, including how to destroy GLaDOS's rocket turret and incinerate the spheres.

The computer will deliver several lines of dialogue as you progress through this section. Initially, it will express regret over a destroyed "fluidic catalytic cracking unit" that made shoes for orphans, then accuse you of murder and express its ability to feel pain. It will then declare an end to conversation and a beginning to killing, stating that it will no longer speak to you.

To make GLaDOS drop the next sphere, shoot a portal at the wall in front of the rocket turret, then place another portal directly above it. The turret will pick up the sphere and hover it slightly above the ground. Shoot a portal behind the sphere, then walk through the portal on the ground to retrieve it. Position the portal over the incinerator again, and place the other portal above the stairs near the button. Drop the sphere into the incinerator.

While holding the sphere, it will ask various questions such as "Who are you?", "What is that?", and "Are you coming back?". It will also comment on your legs and if you are carrying a gun.

After dropping the sphere into the incinerator, it will scream, and the computer will deliver a lengthy monologue. It will claim that you are not doing damage, that two plus two equals ten in base four, and that it allowed you to survive out of curiosity. It will state that you destroyed that part of it and that it cannot deliver neurotoxins faster. It will mention that you were given every opportunity to succeed and that a party was planned for you, including your best friend, the companion cube, whom you murdered. It will also state that your other friends could not attend because you have no other friends, citing your unlikable nature from your personnel file, which also mentions you were adopted.

If you wait, the computer will further elaborate on curiosity, asking if you wonder what happens after death and hinting that you will find out soon, advising you to pack as much living into the next few minutes as possible.

Repeat the process of having the rocket shoot at the computer. This will elevate the sphere onto a platform. Shoot a portal on the wall above the platform, then travel through the portal on the ground (where the missile entered). While falling, place a portal where you will land. This will transport you to the platform with the sphere. Repeat the incineration method as described previously.

If you hold the sphere long enough, it will recite a list of ingredients, including cake mix, frosting, oil, eggs, chocolate chips, butter, sugar, flour, fish-shaped crackers, candies, solid waste, dirt, ethyl benzene, licorice, organic compounds, sediment, peanut butter pieces, lemon juice, alpha resins, unsaturated polyester resin, fiberglass surface resin, volatile malted milk impoundments, egg yolks, geosynthetic membranes, granulated sugar, an entry about killing someone with bare hands, rhubarb in various forms, and an adjustable aluminum head positioner, slaughter electric needle injector, cordless electric needle injector, injector needle driver, injector needle gun, cranial caps, and preservatives, deep penetrative agents, and gas and odor control chemicals to deodorize and preserve putrid tissue.

After you dispose of this sphere, it will scream, and the computer will state that the neurotoxin is not deadly, that it was a joke, and that it could bathe in it or put it on cereal.