This question is part of the best-puzzle award series.

What are your nominations for the best puzzles, here on Puzzling.SE, of the fourth quarter ( October / November / December ) 2019?

Suggested guidelines for nomination:

  • Nominate each individual puzzle in a separate answer, so they can be upvoted/downvoted separately.

  • No more than 3 nominations per person.

  • Don't nominate your own puzzles.

  • Before you nominate a puzzle, check to see if someone else has already nominated it. If they have, then add to that nomination as a comment (or edit it) instead of nominating the same puzzle again.

  • In your nomination, explain what it is that (in your opinion) makes the nominated puzzle such a good one.

Some lists to help jog your memory (your nomination doesn't have to be from these lists):

Algorithmically selected "best of":

Best by votes/views:

Meta-meta issues:

  • Is this kind of thing allowed on SE?

  • What's the point?

  • To highlight and encourage good practice in a way that goes beyond upvotes.

  • To work towards building a 'hall of fame' of some of the best puzzles on the site (perhaps to reside on a future puzzling.SE blog) - think of it as our 'greatest hits album'.

  • To prompt members to put forward their own reflections on what makes a high-quality puzzle.

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  • 2
    $\begingroup$ I thought it was time we caught up on the past few instalments of this thread! Reading the 'Best puzzles of...' posts really helped me get into Puzzling as a community and appreciate what makes a well-received puzzle on this site. I think we would all benefit as a community by bringing this to mind again. (I will now launch the next two of these posts as well...) $\endgroup$ – Stiv Sep 15 at 8:55
  • $\begingroup$ I really want some answers here... come on, fellow puzzlers! I wasn't around at this point but most of you were. $\endgroup$ – bobble Sep 19 at 15:58

This new puzzle type needs a name by Stiv

This one must have been a massive amount of work to pull off. It fits together two rather restrictive logic puzzle types into a single large grid, using clever visuals to hint at possible steps to be taken next. The puzzle became a big hit, being one of the most upvoted questions of 2019, and launched a million-dollar thousand-rep puzzle franchise. It has inspired several other mashups of different puzzle types by other users. Stiv's thorough self-answer detailing the creation process makes it all the more informative and interesting for fellow puzzlers.

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