What is the crowd's opinion of SuFreeDoku?

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So I was bored and decided to plot out the data I got out of my Sudoku app. Program used was Excel 2013 with the "Data Net" preset(at least that's what it is called in German) which I altered a little bit.

Here is the album with a more simple graphic and the raw data if anyone is interested.

Edit: To add a little, I used this form of visual representation because it seemed interesting to me, I don't think I have seen it too often.

This one.