This is the thirty-first installment of the Fortnightly Topic Challenge described here, with topics suggested and voted on here. This fortnight's topic is hybrids of (suggested by paramesis), and will span from the the 19th of June to the 2nd of July. During this period, we will compile the list of questions with this tag and post it as an answer to this question.

In the meantime, please go and propose and vote on future challenges!

Everyone have fun, and happy puzzling!

Link to other Fortnightly Topic Challenges.

For those that cannot see the deleted answer suggestion, here is how the grid deduction hybrid was described:

In these, you combine multiple grid deduction puzzle types. I've seen a few posted here involving Sudoku:

Revenge of the Cryptic Crossword Sudoku
Empty sudoku puzzle
Introducing Domidoku!
Sudoku embedded in a Kakuro

Here are several more examples:

Yajilin Battleships
Cave Battle
Fillomino Kropki
Kropki Loop
Battleships Myopia
Pentominous Star Battle
Yajilin Myopia
Japanese Latin Sums
Masyu Battleships
Easy As Kakuro

Due to the nature of this challenge, please add your own questions to the list below.

  • 1
    $\begingroup$ chat.stackexchange.com/transcript/14524?m=38222710#38222710 $\endgroup$
    – n_plum
    Jun 19, 2017 at 19:48
  • $\begingroup$ Will any puzzle that is a grid to be deduced qualify or does it need to be a hybrid of a known grid puzzle type? $\endgroup$
    – Forklift
    Jun 20, 2017 at 16:31
  • 1
    $\begingroup$ @Forklift the request specifically mentioned hybrids. It's not yet deleted, so you can see it here $\endgroup$ Jun 20, 2017 at 16:37
  • $\begingroup$ Ah, ok. Looks like hybrids of known puzzles. Thanks. $\endgroup$
    – Forklift
    Jun 20, 2017 at 16:39
  • $\begingroup$ Is it alright to have a grid-deduction puzzle that has only one type, but is unconventional in another way? $\endgroup$
    – boboquack
    Jun 20, 2017 at 22:04
  • $\begingroup$ @boboquack I would think that would be fine $\endgroup$ Jun 21, 2017 at 13:12
  • $\begingroup$ Hi David, thanks for maintaining the FTC posts! If you don't mind, my bot (RottersSlave) could take over that task again starting from 2nd of July. $\endgroup$ Jun 25, 2017 at 20:00
  • $\begingroup$ @LukasRotter That's fine by me. $\endgroup$ Jun 26, 2017 at 13:52

1 Answer 1


List of all grid-deduction questions published as part of the Fortnightly Topic Challenge #32:

The highest-voted of these is The Ludicrous Loop: over a thousand cells of circular logic!, with a score of 40 at the end of the fortnight.

The most viewed is The Ludicrous Loop: over a thousand cells of circular logic!, with approximately 817 views during the fortnight.

  • $\begingroup$ Woah, this is going to be pretty close $\endgroup$
    – Wen1now
    Jun 25, 2017 at 5:30

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