Portals

A curious P-body testing and playing with the Portal Gun.

“

Momentum, a function of mass and velocity, is conserved between portals. In layman's terms: Speedy-thing goes in, speedy-thing comes out. Click to listen — GLaDOS

”

Portals are the primary gameplay mechanic of the Portal series. Portals can only be placed on white, flat surfaces by a Handheld Portal Device (simply referred to as a Portal Gun), and works in pairs thereby allowing two-way movement through each portal.

Overview

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P-Body's portals

Primary-fire portal   Secondary-fire portal   Both portals

Pre-release designs

Chell's portals

Primary-fire portal rift as seen in the Orientation Video teaser trailer.   A dated screenshot from the Steam Store depicting early portals, now bearing a proper oval shape.