I'm fairly comfortable tossing a Weighted Pivot Cube or Companion Cube around an Aperture Science test chamber, but some Portal 2 players make cube-handling look like, well, a science.
Some liberties are taken with the physics of the recently released Portal 2, specifically a "re-portaling technique" that offers a nice little velocity boost, but in general this is just good old hand-eye coordination mixed with cleverness at work. The video creator is promising a sequel, but I suspect it'll get far more impressive with the challenge levels from the first Portal 2 DLC pack hit.
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Seen via Reddit.