Dual Pit Experiment achievement in Portal 2

Dual Pit Experiment

Do the same test twice

Dual Pit Experiment0
1 guideOffline Game ModeSingle PlayerMain Storyline

How to unlock the Dual Pit Experiment achievement

  • YaziteYazite33,577
    09 Feb 2016 10 Feb 2016
    2 1 0
    Story related and cannot be missed.

    This is achieved at the very start of Chapter 8.
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