He hit the nail on the head...
"I am sorry, but it is not possible to complete a puzzle in 1 second, not to mention there are several that were completed in the 30 second range. Even if you memorize all of the possible puzzle combinations, the average number of blank squares is 58 on easy, that would be an average of 116 key presses"
How fast can you make 116 presses when you read them from a piece of paper? and how fast can you make 116 presses while solving the puzzle? The two minute mark is roughly one per second...
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