1. Portal 2
  2. Preservation of Mass
  3. Guide by Shenron

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Portal 2

Portal 2

Steam Deck Verified
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4.62*
Game action
Portal 2
Preservation of Mass

Break the rules in Test Chamber 07

Preservation of Mass0
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.
ShenronShenron129,431
14 Aug 2015 20 Feb 2022 20 Feb 2022