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Why not?
Only pencil, but then, I never bother to erase an entire puzzle, either... most of its done already!
Cross it off and move on.
I do these: http://www.websudoku.com/?level=4
I'm just here to laugh at people who make mistakes.
I do these: http://www.websudoku.com/?level=4
Pretty good. They don't get much harder, unless you try to do a completely blank one.Took me just under half an hour 29 mins 45 secs with interruptions.![]()
Pretty good. They don't get much harder, unless you try to do a completely blank one.
I do these: http://www.websudoku.com/?level=4