Neat, but the "Diffictulty" slider is a bit of a misnomer, IMHO. Puzzles with more pieces just take longer. I'm not sure what would be a better label, though. (If I were feeling uncharitable, I would propose "Tedium", or perhaps "Carpal Tunnel Risk" :-)
I wonder if there might be a way of changing the difficulty without changing the number of pieces? Like maybe putting gridlines between the pieces, so that you can't actually see the seamless connection between two correctly-oriented pieces?
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