Preservation of Mass trophy in Portal 2

Preservation of Mass

Break the rules in Test Chamber 07

Preservation of Mass0
1 guideOffline Game ModeSingle Player

How to unlock the Preservation of Mass trophy

  • maiden-of-hastemaiden-of-haste7,960
    31 Jul 2013 31 Jul 2013
    3 0 0
    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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