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Portal 1 goo.jpg
Portal 2 goo.jpg
General information

Aperture Science


Contaminated water

Used by

Test Subjects

Game information

25/tick (Portal)
Instant kill (Portal 2)[1]

"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."

The Goo,[2][3] also known as Contaminated Water,[1] Moat,[1] Toxic Water or simply Acid, is a common environmental hazard in both Portal and Portal 2. It is often found in Test Chambers, where it usually functions as a testing element, as well as in various maintenance areas. It also fills the very bottom of Test Shaft 09.


Goo is usually present within Test Chambers to add a hazardous element to the equation. Any contact with the Goo will result in continuous damage that would eventually kill a Test Subject within a few seconds. In Portal, the death appears as in the Half-Life series (i.e. the view of the bottom of the Goo pit, with the ability to look around); in Portal 2, the screen simply goes to green.

In Portal, the Goo appears as a mixture of red, green, and brown-colored liquid with a swirled appearance, often with mist swirling around its presence. In Portal 2, the Goo appears to be mainly brown, though still with a swirled appearance.

Cubes of any kind or Sentry Turrets that have fallen into the Goo are irretrievable.

Related Achievements[edit]

Portal 2
PARTNER DROP.jpg Empty Gesture (25G)
Drop your co-op partner in Goo while they are gesturing by removing the bridge under them.

Behind the scenes[edit]

The Goo can be seen as the Portal series equivalent of the radioactive / toxic waste from the Half-Life series, which serves a similar purpose.

In the Perpetual Testing Initiative game files can be found an early model named goo_tap.3ds and a corresponding texture file called goo_tap.png. It resembles a round black and white drainage gate valve, approximately the size of a Thermal Discouragement Beam emitter, controlled with a blue wheel. The texture additionally features a corrosive substance pictogram and references to an activation mechanism; these, however, remain unassigned to any polygons and can also be found in other testing elements' texture files.[4] A similar model, albeit lacking the blue wheel, can be seen in the DLC's trailer; given its black backside, the texture used appears to be the one found in the retail game files, goo_plug.vtf.[5][4] The model goo_tap.mdl present among the final game files shows Bendy drowning in waves of Goo. However, the placeable testing element model utilizes a combination of two different files instead: goo_man.mdl and goo_man_water.mdl.[4] Although both the early and the retail variants can be placed on the floor as well as walls in their respective game builds, there is no visual difference between these positions for the final version of this testing element's Puzzle Editor model.[5][4]



Portal 2[edit]

List of appearances[edit]