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| “ | If you rubbed your cheek on one, it would be like standing outside with the sun shining on your face. It would also set your hair on fire, so don't actually do it.
— GLaDOS
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A Hard-Light Bridge, or simply called Light Bridge, is a semi-translucent solid made from natural sunlight beamed in from the surface. It can act as a bridge for the player, a shield against turrets and other hazards, or even a wall for more complex puzzles the player encounters later on. The bridges span an infinite length or until stopped by another solid, meaning the player won't have to worry about the length of the bridge being a problem.
Hard-Light Bridges can also be covered in Mobility Gels, allowing the player to use the gels in places where it normally would just fall through. Gels placed on Hard-Light Bridges are not permanent and disappears the moment the bridge dissipates or moves to a different location.