A curious
P-body testing and playing with the Portal Gun.
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Momentum, a function of mass and velocity, is conserved between portals. In layman's terms: Speedy-thing goes in, speedy-thing comes out.
— GLaDOS
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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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Pre-release designs
| Chell's portals |
| A dated screenshot from the Steam Store depicting early portals, now bearing a proper oval shape.
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References
