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Published on Apr 29, 2011
Achievement description: Beat Test Chamber 10 in 70 seconds.
Just a video walk-through for those having trouble with this one, since a text walk-through might not be easy to follow. Test Chamber 10 is in chapter 3, and it is the second puzzle. Remember you can load your last save if you mess up.
Another note, the timer stops when you put the cube on the button to open the door, so the achievement should pop up at that moment.