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Published on Nov 20, 2011
Most of these clips are taken with a modified portal gun that can aim slightly up or down and has infinite 'ammo'. That said, everything you see here should be possible with an unmodified portal gun, if used as shown in the first 42 seconds of the video: The only issue is that since the standard portal gun cannot aim down, you will have to portal sideways instead.
I bought a $30 Xbox360 controller (marked up just in time for the holidays!) just to record this video.