Portal 2 Puzzle Maker: Deadly Goo

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This article contains content specific to the Portal 2 Puzzle Maker. For the Authoring Tools equivalent, see Slime Water.

Deadly Goo is a hazard used in Portal and Portal 2. Falling in Deadly Goo will kill the player in a few seconds. It will also destroy any physics objects in a similar way to an Emancipation Grid.

Item Properties

Entity Cost: 1

Note: entity cost is per pit, regardless of the size of the pit.

This item has no properties to set.


Deadly Goo can only be placed in a sealed pit containing no other items (exceptions are the Piston Platform, which can be placed in a Deadly Goo pool of 1 block depth, and the Track Platform, which can be placed so only the arm is submerged). Dragging the icon into an area will instantly fill that area with Deadly Goo. Dragging the icon up or down can increase/decrease the depth of the pool.


Placing two separate pools of Deadly Goo on separate levels in such a way that any part of one is directly above another will cause a bug where the space between the two pools has the Deadly Goo effects (killing the player and fizzling objects), though this will be invisible to the player. Designers encountering this bug are advised to either rearrange the level so that the pools do not overlap, or to replace one of the pools with a Laser Field.

Note.png Note: This has been fixed