Goo[1], also known as Toxic Water, Acid, and Hazard Liquid, is an environmental hazard present in both Portal and Portal 2. It is red, green, and brown-colored liquid with a swirled appearence. Any contact with goo will result in continuous damage that eventualy kills the player within a few seconds. It is usually present in order to provide a penalty for failure, and to ensure that players are precise with their movements and positioning of their Portals.
“ | For this next test, the humans originally requested helmets to avoid brain injuries.I ran the numbers. Making the goo deadly was more cost effective.
— GLaDOS
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Items that fall into goo are unretrievable. In such cases where an object such as a cube is needed to solve test, a replacement will be issued if the first one is dropped into goo.