20 attoseconds is about how long it takes for light to travel one beard-second: http://www.google.com/search?q=1+beard-seconds+%2F+c+in+attoseconds . Coincidence? I think not.
In theory, it might be possible to actually fill a row-- build up a level surface in the bottom half and then play tetris as normal on the top. I wonder if the game would recognize it...
Maybe jets of fire would work better? That I'd like to see.
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