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Across

Here is my first 100% Hammer-made test. It's a short test chamber including a laser and a reflection cube in a destroyed/malfunctioning part of the Aperture facility.

I would say easy to medium difficulty : 5-15 mins.

Any feedback greatly appreciated !

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! Don't watch if you don't want spoilers !

Solution by Equinox : http://youtu.be/DV1cPQk95CE