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Puzzling

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  • $\begingroup$ How about outlines of shapes (diamond, circle, square, star, etc...) on each grid space? $\endgroup$
    – humfuzz
    Commented Jun 13, 2018 at 17:13
  • 1
    $\begingroup$ That might work as well, but I fear that especially when lots of numbers have been filled in it'll get unclear as well. $\endgroup$
    – Glorfindel
    Commented Jun 13, 2018 at 17:18
  • $\begingroup$ The question is though: Does at least one solution exist for such a puzzle? I guess there are even less possibilities for three overlapping jigsaws $\endgroup$
    – Narusan
    Commented Jun 13, 2018 at 18:32
  • $\begingroup$ Without the row/column constraints I don't see why not. $\endgroup$
    – phenomist
    Commented Jun 14, 2018 at 0:35
  • 1
    $\begingroup$ If you made a phone app (for example), you could have a switch to change the outlines shown instead of having all of the mess on screen at once. That way you wouldn't have to make sure to mark the same numbers in two spots, at least. $\endgroup$
    – Ian MacDonald
    Commented Jun 14, 2018 at 20:30