Goo(AKA Acid, or Toxic Water) is a Testing Element in the Portal franchise. It is similar to Gel, but seems to be highly toxic and is deeper. Contact with it results in death, and it emits a poisonous fog. Details in-game have led people to theorize that Goo is a failed Gel. If objects are dropped into Goo, they are lost.


800px-P2 sp goo

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