1. Portal 2
  2. Dual Pit Experiment
  3. Guide by Yazite

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Portal 2

Portal 2

Steam Deck Verified
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4.62*
Game action
Portal 2
Dual Pit Experiment

Do the same test twice

Dual Pit Experiment0
1 guideOffline Mode - These achievements require play in game modes that do not necessitate a connection to any online services.Single Player - These achievements can be obtained by a single player.Main Storyline - These achievements are gained automatically by progressing through the main game mode.
YaziteYazite58,278
09 Feb 2016 10 Feb 2016
3 1 0
Story related and cannot be missed.

This is achieved at the very start of Chapter 8.