|This article is non-canon.|
The subject matter of this article does not take place in the "real" Half-Life and Portal universe and is considered non-canon.
Hazardous testing element
The electric floor consists of two rectangular devices located opposite each other, with one on the floor and the other on the ceiling. It periodically turns on and off; while it's active, any Test Subject caught in the electric field generated between those two devices dies instantly.
Behind the scenes
The electric floor originates from Portal: The Flash Version, remade by fans for Portal as Portal: The Flash Version MapPack. Levels from the map pack were the basis for the challenge maps included in Portal: Still Alive.