Preservation of Mass achievement in Portal 2

Preservation of Mass

Break the rules in Test Chamber 07

Preservation of Mass0
Hide ads

How to unlock the Preservation of Mass achievement

  • ShenronShenron129,897
    14 Aug 2015 20 Feb 2022 20 Feb 2022
  • Have you got any tips or tricks to unlock this achievement?
    Add a guide to share them with the community.

    Sign in and add a guide
Do you have a question about this achievement? Please post it in the Portal 2 Forum