Portal 2

Portal 2

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15-20h

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Preservation of Mass

Preservation of Mass

Break the rules in Test Chamber 07

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How to unlock the Preservation of Mass achievement in Portal 2 - Definitive Guide

Chapter 2 - Chamber 7

Use the third cube to block the laser and call the elevator. Now use the white platforms to bring the box to the pad, and shown in the video. Reach the exit zone, and take the hint from Glados. Shoot a Portal on any surface in the hallway, and take the cube through the other one, unlocking the achievement!

You can also get this achievement in Challenge mode, playing "The Cold Boot - Pit Flings".
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21 Apr 2011 03:24

4 Comments
Good guide, missed it on my 1st play.
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By Calex dEUS on 27 Apr 2011 18:28
Voted neg to try to get you to add the Challenge name: The Cold Boot -- Pit Flings.
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By Curtieson on 21 Jul 2012 20:57
Good guide! Thanks again Maka 👍👍
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By Oni Scorpion on 05 Feb 2019 18:10
I actually got the achievement by surprise. I went to get the companion cube after GLaDOS mentioned there was no emancipation grid.
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By Avrexid on 23 Apr 2011 19:14
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Other solutions show you how to do the level, that takes the fun out of the game, instead read this:

The achievement requires you take your companion cube with you through the door towards the lift so as you walk through there is a wall you can place a portal on. Go grab your cube, pop the other portal, walk through and pop!
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23 Apr 2011 23:32

2 Comments
Pop as in what? The achievement, the companion cube, or both? :(
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By MoogMod on 27 Apr 2011 19:57
Well the achievement will pop, if you try to take it into the lift the cube will then disintegrate, so I guess that's kind of like popping too
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By Daradus on 29 Apr 2011 00:55
Chapter 2: The Cold Boot. Test Chamber 7.

When you place the Companion Cube on the button, place it as CLOSE as you can to the wall and to the right (below the edge). Now continue on and when you are above the cube, go as close as you can to the edge and crouch and grab the cube. Now walk through the door and the achievement will unlock.

Video credits: Rooster & Teeth
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update your video mate
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By I TRU RELIG1ON on 11 Apr 2012 21:48
Reported Content edit: Video now fixed.
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By on 24 Oct 2014 15:19
Chapter 2 Chamber 7. At the end of the level stick a portal on the exit corridor and go back to take the companion cube with you through to the lift to the next level.
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31 Jul 2013 20:37

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20 Feb 2022 00:00

In Chapter 2, Test Chamber 07, after solving the chamber GLaDOS will mention the force field that prevents you from taking items from the chamber is broken. Make a blue portal on the wall of the hallway leading to the elevator. Then ensure you have a yellow portal setup in the cube vicinity to take the cube up to the exit with . This will allow you to attempt to break the rules and go through the broken force field.

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Chapter 2
Challenge Room 7

It is necessary to remove the cube from the test room bypassing the expropriation field. When you open the door, make a portal right behind it. Take the cube, and make a second portal in the pit, jump into the portal, and you will find yourself with the cube at the elevator, thereby breaking the rules.
VIDEO
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20 Jul 2011 04:15